diff --git a/Builds/CMake/RippledCore.cmake b/Builds/CMake/RippledCore.cmake
index 03a760084..2fe7f1a51 100644
--- a/Builds/CMake/RippledCore.cmake
+++ b/Builds/CMake/RippledCore.cmake
@@ -573,6 +573,7 @@ target_sources (rippled PRIVATE
   src/ripple/rpc/handlers/AccountLines.cpp
   src/ripple/rpc/handlers/AccountObjects.cpp
   src/ripple/rpc/handlers/AccountOffers.cpp
+  src/ripple/rpc/handlers/AccountNamespace.cpp
   src/ripple/rpc/handlers/AccountTx.cpp
   src/ripple/rpc/handlers/AccountTxOld.cpp
   src/ripple/rpc/handlers/BlackList.cpp
diff --git a/src/ripple/net/impl/RPCCall.cpp b/src/ripple/net/impl/RPCCall.cpp
index a8d72eda2..a55422a4c 100644
--- a/src/ripple/net/impl/RPCCall.cpp
+++ b/src/ripple/net/impl/RPCCall.cpp
@@ -785,6 +785,13 @@ private:
         return parseAccountRaw2(jvParams, jss::peer);
     }
 
+    // account_namespace <account> <namespace hex> [<ledger>]
+    Json::Value
+    parseAccountNamespace(Json::Value const& jvParams)
+    {
+        return parseAccountNamespaceRaw(jvParams);
+    }
+
     // account_channels <account> <account>|"" [<ledger>]
     Json::Value
     parseAccountChannels(Json::Value const& jvParams)
@@ -865,6 +872,61 @@ private:
         return jvRequest;
     }
 
+    Json::Value
+    parseAccountNamespaceRaw(Json::Value const& jvParams)
+    {
+        auto const nParams = jvParams.size();
+        Json::Value jvRequest(Json::objectValue);
+
+        for (auto i = 0; i < nParams; ++i)
+        {
+            std::string strParam = jvParams[i].asString();
+
+            if (i == 0)
+            {
+                // account
+                if (parseBase58<PublicKey>(
+                        TokenType::AccountPublic, strParam) ||
+                    parseBase58<AccountID>(strParam) ||
+                    parseGenericSeed(strParam))
+                {
+                    jvRequest[jss::account] = std::move(strParam);
+                }
+                else
+                {
+                    return rpcError(rpcACT_MALFORMED);
+                }
+                continue;
+            }
+            
+            if (i == 1)
+            {
+                // namespace hex
+                uint256 namespaceId;
+                if (!namespaceId.parseHex(strParam))
+                    return rpcError(rpcNAMESPACE_MALFORMED);
+                jvRequest[jss::namespace_id] = to_string(namespaceId);
+                continue;
+            }
+            
+            if (i == 2)
+            {
+                // ledger index (optional)
+                if (strParam.empty())
+                    break;
+
+                if (jvParseLedger(jvRequest, strParam))
+                    break;
+                else
+                    return rpcError(rpcLGR_IDX_MALFORMED);
+                
+                continue;
+            }
+        }
+
+        return jvRequest;
+    }
+
     Json::Value
     parseAccountRaw2(Json::Value const& jvParams, char const* const acc2Field)
     {
@@ -1237,6 +1299,7 @@ public:
             {"account_currencies", &RPCParser::parseAccountCurrencies, 1, 3},
             {"account_info", &RPCParser::parseAccountItems, 1, 3},
             {"account_lines", &RPCParser::parseAccountLines, 1, 5},
+            {"account_namespace", &RPCParser::parseAccountNamespace, 2, 3},
             {"account_channels", &RPCParser::parseAccountChannels, 1, 3},
             {"account_objects", &RPCParser::parseAccountItems, 1, 5},
             {"account_offers", &RPCParser::parseAccountItems, 1, 4},
diff --git a/src/ripple/protocol/ErrorCodes.h b/src/ripple/protocol/ErrorCodes.h
index 45fa7da29..bbdcdfd3b 100644
--- a/src/ripple/protocol/ErrorCodes.h
+++ b/src/ripple/protocol/ErrorCodes.h
@@ -68,7 +68,8 @@ enum error_code_i {
 
     // Ledger state
     rpcACT_NOT_FOUND = 19,
-    // unused                  20,
+    rpcNAMESPACE_NOT_FOUND = 20,
+    
     rpcLGR_NOT_FOUND = 21,
     rpcLGR_NOT_VALIDATED = 22,
     rpcMASTER_DISABLED = 23,
@@ -90,7 +91,7 @@ enum error_code_i {
     rpcACT_MALFORMED = 35,
     rpcALREADY_MULTISIG = 36,
     rpcALREADY_SINGLE_SIG = 37,
-    // unused                  38,
+    rpcNAMESPACE_MALFORMED = 38,
     // unused                  39,
     rpcBAD_FEATURE = 40,
     rpcBAD_ISSUER = 41,
diff --git a/src/ripple/protocol/impl/ErrorCodes.cpp b/src/ripple/protocol/impl/ErrorCodes.cpp
index 87fb2da2a..b278b6604 100644
--- a/src/ripple/protocol/impl/ErrorCodes.cpp
+++ b/src/ripple/protocol/impl/ErrorCodes.cpp
@@ -34,6 +34,7 @@ namespace detail {
 constexpr static ErrorInfo unorderedErrorInfos[]{
     {rpcACT_MALFORMED, "actMalformed", "Account malformed."},
     {rpcACT_NOT_FOUND, "actNotFound", "Account not found."},
+    {rpcNAMESPACE_NOT_FOUND, "nsNotFound", "Namespace not found."},
     {rpcALREADY_MULTISIG, "alreadyMultisig", "Already multisigned."},
     {rpcALREADY_SINGLE_SIG, "alreadySingleSig", "Already single-signed."},
     {rpcAMENDMENT_BLOCKED,
@@ -87,6 +88,7 @@ constexpr static ErrorInfo unorderedErrorInfos[]{
     {rpcLGR_NOT_FOUND, "lgrNotFound", "Ledger not found."},
     {rpcLGR_NOT_VALIDATED, "lgrNotValidated", "Ledger not validated."},
     {rpcMASTER_DISABLED, "masterDisabled", "Master key is disabled."},
+    {rpcNAMESPACE_MALFORMED, "namespaceMalformed", "Namespace identifier is malformed."},
     {rpcNOT_ENABLED, "notEnabled", "Not enabled in configuration."},
     {rpcNOT_IMPL, "notImpl", "Not implemented."},
     {rpcNOT_READY, "notReady", "Not ready to handle this request."},
diff --git a/src/ripple/protocol/jss.h b/src/ripple/protocol/jss.h
index 12217688c..74571fb96 100644
--- a/src/ripple/protocol/jss.h
+++ b/src/ripple/protocol/jss.h
@@ -392,6 +392,8 @@ JSS(minimum_fee);                // out: TxQ
 JSS(minimum_level);              // out: TxQ
 JSS(missingCommand);             // error
 JSS(name);                       // out: AmendmentTableImpl, PeerImp
+JSS(namespace_entries);          // out: AccountNamespace
+JSS(namespace_id);               // in/out: AccountNamespace
 JSS(needed_state_hashes);        // out: InboundLedger
 JSS(needed_transaction_hashes);  // out: InboundLedger
 JSS(network_id);                 // out: NetworkOPs
diff --git a/src/ripple/rpc/handlers/AccountNamespace.cpp b/src/ripple/rpc/handlers/AccountNamespace.cpp
new file mode 100644
index 000000000..e661d9e32
--- /dev/null
+++ b/src/ripple/rpc/handlers/AccountNamespace.cpp
@@ -0,0 +1,135 @@
+//------------------------------------------------------------------------------
+/*
+    This file is part of rippled: https://github.com/ripple/rippled
+    Copyright (c) 2012-2014 Ripple Labs Inc.
+
+    Permission to use, copy, modify, and/or distribute this software for any
+    purpose  with  or without fee is hereby granted, provided that the above
+    copyright notice and this permission notice appear in all copies.
+
+    THE  SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+    WITH  REGARD  TO  THIS  SOFTWARE  INCLUDING  ALL  IMPLIED  WARRANTIES  OF
+    MERCHANTABILITY  AND  FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+    ANY  SPECIAL ,  DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+    WHATSOEVER  RESULTING  FROM  LOSS  OF USE, DATA OR PROFITS, WHETHER IN AN
+    ACTION  OF  CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+//==============================================================================
+
+#include <ripple/app/main/Application.h>
+#include <ripple/json/json_writer.h>
+#include <ripple/ledger/ReadView.h>
+#include <ripple/net/RPCErr.h>
+#include <ripple/protocol/ErrorCodes.h>
+#include <ripple/protocol/Indexes.h>
+#include <ripple/protocol/LedgerFormats.h>
+#include <ripple/protocol/jss.h>
+#include <ripple/resource/Fees.h>
+#include <ripple/rpc/Context.h>
+#include <ripple/rpc/impl/RPCHelpers.h>
+#include <ripple/rpc/impl/Tuning.h>
+
+#include <sstream>
+#include <string>
+
+namespace ripple {
+
+/** RPC command that retreives hook state objects from a particular namespace in a particular account.
+    {
+      account: <account>|<account_public_key>
+      namespace_id: <namespace hex>
+      ledger_hash: <string> // optional
+      ledger_index: <string | unsigned integer> // optional
+      type: <string> // optional, defaults to all account objects types
+      limit: <integer> // optional
+      marker: <opaque> // optional, resume previous query
+    }
+*/
+
+Json::Value
+doAccountNamespace(RPC::JsonContext& context)
+{
+    auto const& params = context.params;
+    if (!params.isMember(jss::account))
+        return RPC::missing_field_error(jss::account);
+
+    if (!params.isMember(jss::namespace_id))
+        return RPC::missing_field_error(jss::namespace_id);
+
+    std::shared_ptr<ReadView const> ledger;
+    auto result = RPC::lookupLedger(ledger, context);
+    if (ledger == nullptr)
+        return result;
+
+    AccountID accountID;
+    {
+        auto const strIdent = params[jss::account].asString();
+        if (auto jv = RPC::accountFromString(accountID, strIdent))
+        {
+            for (auto it = jv.begin(); it != jv.end(); ++it)
+                result[it.memberName()] = *it;
+
+            return result;
+        }
+    }
+
+    auto const ns = params[jss::namespace_id].asString();
+
+    uint256 nsID = beast::zero;
+
+    if (!nsID.parseHex(ns))
+        return rpcError(rpcINVALID_PARAMS);
+    
+    if (!ledger->exists(keylet::account(accountID)))
+        return rpcError(rpcACT_NOT_FOUND);
+
+    if (!ledger->exists(keylet::hookStateDir(accountID, nsID)))
+        return rpcError(rpcNAMESPACE_NOT_FOUND);
+
+    unsigned int limit;
+    if (auto err = readLimitField(limit, RPC::Tuning::accountObjects, context))
+        return *err;
+
+    uint256 dirIndex;
+    uint256 entryIndex;
+    if (params.isMember(jss::marker))
+    {
+        auto const& marker = params[jss::marker];
+        if (!marker.isString())
+            return RPC::expected_field_error(jss::marker, "string");
+
+        std::stringstream ss(marker.asString());
+        std::string s;
+        if (!std::getline(ss, s, ','))
+            return RPC::invalid_field_error(jss::marker);
+
+        if (!dirIndex.parseHex(s))
+            return RPC::invalid_field_error(jss::marker);
+
+        if (!std::getline(ss, s, ','))
+            return RPC::invalid_field_error(jss::marker);
+
+        if (!entryIndex.parseHex(s))
+            return RPC::invalid_field_error(jss::marker);
+    }
+
+    if (!RPC::getAccountNamespace(
+            *ledger,
+            accountID,
+            nsID,
+            dirIndex,
+            entryIndex,
+            limit,
+            result))
+    {
+        result[jss::account_objects] = Json::arrayValue;
+    }
+
+    result[jss::account] = context.app.accountIDCache().toBase58(accountID);
+    result[jss::namespace_id] = ns;
+    context.loadType = Resource::feeMediumBurdenRPC;
+    return result;
+}
+
+}  // namespace ripple
diff --git a/src/ripple/rpc/handlers/Handlers.h b/src/ripple/rpc/handlers/Handlers.h
index 264d0a3f1..687671cdc 100644
--- a/src/ripple/rpc/handlers/Handlers.h
+++ b/src/ripple/rpc/handlers/Handlers.h
@@ -37,6 +37,8 @@ doAccountObjects(RPC::JsonContext&);
 Json::Value
 doAccountOffers(RPC::JsonContext&);
 Json::Value
+doAccountNamespace(RPC::JsonContext&);
+Json::Value
 doAccountTxJson(RPC::JsonContext&);
 Json::Value
 doBookOffers(RPC::JsonContext&);
diff --git a/src/ripple/rpc/impl/Handler.cpp b/src/ripple/rpc/impl/Handler.cpp
index 7c193f554..5b02a280c 100644
--- a/src/ripple/rpc/impl/Handler.cpp
+++ b/src/ripple/rpc/impl/Handler.cpp
@@ -66,6 +66,7 @@ Handler const handlerArray[]{
      Role::USER,
      NO_CONDITION},
     {"account_lines", byRef(&doAccountLines), Role::USER, NO_CONDITION},
+    {"account_namespace", byRef(&doAccountNamespace), Role::USER, NO_CONDITION},
     {"account_channels", byRef(&doAccountChannels), Role::USER, NO_CONDITION},
     {"account_objects", byRef(&doAccountObjects), Role::USER, NO_CONDITION},
     {"account_offers", byRef(&doAccountOffers), Role::USER, NO_CONDITION},
diff --git a/src/ripple/rpc/impl/RPCHelpers.cpp b/src/ripple/rpc/impl/RPCHelpers.cpp
index 5c42aae96..b3e0813dd 100644
--- a/src/ripple/rpc/impl/RPCHelpers.cpp
+++ b/src/ripple/rpc/impl/RPCHelpers.cpp
@@ -226,6 +226,89 @@ getAccountObjects(
     }
 }
 
+bool
+getAccountNamespace(
+    ReadView const& ledger,
+    AccountID const& account,
+    uint256 const& ns,
+    uint256 dirIndex,
+    uint256 const& entryIndex,
+    std::uint32_t const limit,
+    Json::Value& jvResult)
+{
+    auto const root = keylet::hookStateDir(account, ns);
+    auto found = false;
+
+    if (dirIndex.isZero())
+    {
+        dirIndex = root.key;
+        found = true;
+    }
+
+    auto dir = ledger.read({ltDIR_NODE, dirIndex});
+    if (!dir)
+        return false;
+
+    std::uint32_t i = 0;
+    auto& jvObjects = (jvResult[jss::namespace_entries] = Json::arrayValue);
+    for (;;)
+    {
+        auto const& entries = dir->getFieldV256(sfIndexes);
+        auto iter = entries.begin();
+
+        if (!found)
+        {
+            iter = std::find(iter, entries.end(), entryIndex);
+            if (iter == entries.end())
+                return false;
+
+            found = true;
+        }
+
+        for (; iter != entries.end(); ++iter)
+        {
+            auto const sleNode = ledger.read(keylet::child(*iter));
+
+            jvObjects.append(sleNode->getJson(JsonOptions::none));
+
+            if (++i == limit)
+            {
+                if (++iter != entries.end())
+                {
+                    jvResult[jss::limit] = limit;
+                    jvResult[jss::marker] =
+                        to_string(dirIndex) + ',' + to_string(*iter);
+                    return true;
+                }
+
+                break;
+            }
+        }
+
+        auto const nodeIndex = dir->getFieldU64(sfIndexNext);
+        if (nodeIndex == 0)
+            return true;
+
+        dirIndex = keylet::page(root, nodeIndex).key;
+        dir = ledger.read({ltDIR_NODE, dirIndex});
+        if (!dir)
+            return true;
+
+        if (i == limit)
+        {
+            auto const& e = dir->getFieldV256(sfIndexes);
+            if (!e.empty())
+            {
+                jvResult[jss::limit] = limit;
+                jvResult[jss::marker] =
+                    to_string(dirIndex) + ',' + to_string(*e.begin());
+            }
+
+            return true;
+        }
+    }
+}
+
 namespace {
 
 bool
diff --git a/src/ripple/rpc/impl/RPCHelpers.h b/src/ripple/rpc/impl/RPCHelpers.h
index e3d44c2e7..0e35dba2a 100644
--- a/src/ripple/rpc/impl/RPCHelpers.h
+++ b/src/ripple/rpc/impl/RPCHelpers.h
@@ -109,6 +109,25 @@ getAccountObjects(
     std::uint32_t const limit,
     Json::Value& jvResult);
 
+/** Gathers all hook state objects for an account namespace in a ledger.
+    @param ledger Ledger to search account objects.
+    @param account AccountID to find objects for.
+    @param ns Namespace ID to find objects for.
+    @param dirIndex Begin gathering account objects from this directory.
+    @param entryIndex Begin gathering objects from this directory node.
+    @param limit Maximum number of objects to find.
+    @param jvResult A JSON result that holds the request objects.
+*/
+bool
+getAccountNamespace(
+    ReadView const& ledger,
+    AccountID const& account,
+    uint256 const& ns,
+    uint256 dirIndex,
+    uint256 const& entryIndex,
+    std::uint32_t const limit,
+    Json::Value& jvResult);
+
 /** Get ledger by hash
     If there is no error in the return value, the ledger pointer will have
     been filled