diff --git a/actions/transactWriteItems.js b/actions/transactWriteItems.js
new file mode 100644
index 0000000..06b27da
--- /dev/null
+++ b/actions/transactWriteItems.js
@@ -0,0 +1,89 @@
+var async = require('async'),
+    putItem = require('./putItem'),
+    deleteItem = require('./deleteItem'),
+    updateItem = require('./updateItem'),
+    db = require('../db')
+
+module.exports = function transactWriteItem(store, data, cb) {
+  var actions = []
+
+  async.series([
+    async.eachSeries.bind(async, data.TransactItems, addActions),
+    async.series.bind(async, actions),
+  ], function(err, responses) {
+    if (err) {
+      if (err.body && (/Missing the key/.test(err.body.message) || /Type mismatch for key/.test(err.body.message)))
+        err.body.message = 'The provided key element does not match the schema'
+      return cb(err)
+    }
+    var res = {UnprocessedItems: {}}, tableUnits = {}
+
+    if (~['TOTAL', 'INDEXES'].indexOf(data.ReturnConsumedCapacity)) {
+      responses[1].forEach(function(action) {
+        var table = action.ConsumedCapacity.TableName
+        if (!tableUnits[table]) tableUnits[table] = 0
+        tableUnits[table] += action.ConsumedCapacity.CapacityUnits
+      })
+      res.ConsumedCapacity = Object.keys(tableUnits).map(function(table) {
+        return {
+          CapacityUnits: tableUnits[table],
+          TableName: table,
+          Table: data.ReturnConsumedCapacity == 'INDEXES' ? {CapacityUnits: tableUnits[table]} : undefined,
+        }
+      })
+    }
+
+    cb(null, res)
+  })
+
+  function addActions(transactItem, cb) {
+      var options = {}
+      var tableName
+
+          if (data.ReturnConsumedCapacity) options.ReturnConsumedCapacity = data.ReturnConsumedCapacity
+
+          if (transactItem.Put) {
+            tableName = transactItem.Put.TableName;
+            options = {TableName: tableName}
+
+            store.getTable(tableName, function(err, table) {
+              if (err) return cb(err)
+              if ((err = db.validateItem(transactItem.Put.Item, table)) != null) return cb(err)
+
+              options.Item = transactItem.Put.Item
+              actions.push(putItem.bind(null, store, options))
+              db.createKey(options.Item, table)
+
+              cb()
+            })
+          } else if (transactItem.Delete) {
+            tableName = transactItem.Delete.TableName;
+            options = {TableName: tableName}
+
+            store.getTable(tableName, function(err, table) {
+              if (err) return cb(err)
+              if ((err = db.validateKey(transactItem.Delete.Key, table) != null)) return cb(err)
+
+              options.Key = transactItem.Delete.Key
+              actions.push(deleteItem.bind(null, store, options))
+
+              db.createKey(options.Key, table)
+
+              cb()
+            })
+          } else if (transactItem.Update) {
+
+            store.getTable(tableName, function(err, table) {
+              if (err) return cb(err)
+              if ((err = db.validateKey(transactItem.Update.Key, table) != null)) return cb(err)
+
+              options.Key = transactItem.Update.Key
+              actions.push(updateItem.bind(null, store, options))
+
+              db.createKey(options.Key, table)
+
+              cb()
+            })
+          }
+  }
+}
diff --git a/index.js b/index.js
index 1c169ca..6a7385d 100644
--- a/index.js
+++ b/index.js
@@ -13,7 +13,7 @@ var MAX_REQUEST_BYTES = 16 * 1024 * 1024
 var validApis = ['DynamoDB_20111205', 'DynamoDB_20120810'],
     validOperations = ['BatchGetItem', 'BatchWriteItem', 'CreateTable', 'DeleteItem', 'DeleteTable',
       'DescribeTable', 'DescribeTimeToLive', 'GetItem', 'ListTables', 'PutItem', 'Query', 'Scan', 'TagResource',
-      'UntagResource', 'ListTagsOfResource', 'UpdateItem', 'UpdateTable'],
+      'UntagResource', 'ListTagsOfResource', 'UpdateItem', 'UpdateTable', 'TransactWriteItems'],
     actions = {},
     actionValidations = {}
 
diff --git a/validations/transactWriteItems.js b/validations/transactWriteItems.js
new file mode 100644
index 0000000..6126ab9
--- /dev/null
+++ b/validations/transactWriteItems.js
@@ -0,0 +1,138 @@
+var validations = require('./index'),
+    db = require('../db')
+
+exports.types = {
+  ReturnConsumedCapacity: {
+    type: 'String',
+    enum: ['INDEXES', 'TOTAL', 'NONE'],
+  },
+  ReturnItemCollectionMetrics: {
+    type: 'String',
+    enum: ['SIZE', 'NONE'],
+  },
+  ClientRequestToken: {
+    type: 'String'
+  },
+  TransactItems: {
+    type: 'List',
+    notNull: true,
+    lengthGreaterThanOrEqual: 1,
+    children: {
+      type: 'ValueStruct<TransactWriteItem>',
+      children: {
+        Put: {
+          type: 'FieldStruct<Put>',
+          children: {
+            TableName: {
+              type: 'String',
+            },
+            ExpressionAttributeValues: {
+              type: 'Map<AttributeValue>',
+              children: 'AttrStruct<ValueStruct>',
+            },
+            ExpressionAttributeNames: {
+              type: 'Map<java.lang.String>',
+              children: 'String',
+            },
+            ReturnValuesOnConditionCheckFailure: {
+              type: 'String',
+              enum: ['ALL_OLD', 'NONE'],
+            },
+            ConditionExpression: {
+              type: 'String',
+            },
+            Item: {
+              type: 'Map<AttributeValue>',
+              notNull: true,
+              children: 'AttrStruct<ValueStruct>',
+            },
+          },
+        },
+        Update: {
+          type: 'FieldStruct<Update>',
+          children: {
+            TableName: {
+              type: 'String',
+            },
+            ExpressionAttributeValues: {
+              type: 'Map<AttributeValue>',
+              children: 'AttrStruct<ValueStruct>',
+            },
+            ExpressionAttributeNames: {
+              type: 'Map<java.lang.String>',
+              children: 'String',
+            },
+            ReturnValuesOnConditionCheckFailure: {
+              type: 'String',
+              enum: ['ALL_OLD', 'NONE'],
+            },
+            ConditionExpression: {
+              type: 'String',
+            },
+            Key: {
+              type: 'Map<AttributeValue>',
+              notNull: true,
+              children: 'AttrStruct<ValueStruct>',
+            },
+          },
+        },
+        Delete: {
+          type: 'FieldStruct<Delete>',
+          children: {
+            TableName: {
+              type: 'String',
+            },
+            ExpressionAttributeValues: {
+              type: 'Map<AttributeValue>',
+              children: 'AttrStruct<ValueStruct>',
+            },
+            ExpressionAttributeNames: {
+              type: 'Map<java.lang.String>',
+              children: 'String',
+            },
+            ReturnValuesOnConditionCheckFailure: {
+              type: 'String',
+              enum: ['ALL_OLD', 'NONE'],
+            },
+            ConditionExpression: {
+              type: 'String',
+            },
+            Key: {
+              type: 'Map<AttributeValue>',
+              notNull: true,
+              children: 'AttrStruct<ValueStruct>',
+            },
+          },
+        },
+        ConditionCheck: {
+          type: 'FieldStruct<ConditionCheck>',
+          children: {
+            TableName: {
+              type: 'String',
+            },
+            ExpressionAttributeValues: {
+              type: 'Map<AttributeValue>',
+              children: 'AttrStruct<ValueStruct>',
+            },
+            ExpressionAttributeNames: {
+              type: 'Map<java.lang.String>',
+              children: 'String',
+            },
+            ReturnValuesOnConditionCheckFailure: {
+              type: 'String',
+              enum: ['ALL_OLD', 'NONE'],
+            },
+            ConditionExpression: {
+              type: 'String',
+            },
+            Key: {
+              type: 'Map<AttributeValue>',
+              notNull: true,
+              children: 'AttrStruct<ValueStruct>',
+            },
+          },
+        },
+      },
+    },
+  },
+}