diff --git a/solr/solrj/src/java/org/apache/solr/client/solrj/io/Lang.java b/solr/solrj/src/java/org/apache/solr/client/solrj/io/Lang.java
index ab140626e0a..e00eeef70af 100644
--- a/solr/solrj/src/java/org/apache/solr/client/solrj/io/Lang.java
+++ b/solr/solrj/src/java/org/apache/solr/client/solrj/io/Lang.java
@@ -172,6 +172,8 @@ public class Lang {
         .withFunctionName("constantDistribution", ConstantDistributionEvaluator.class)
         .withFunctionName("weibullDistribution", WeibullDistributionEvaluator.class)
         .withFunctionName("mean", MeanEvaluator.class)
+        .withFunctionName("var", VarianceEvaluator.class)
+        .withFunctionName("stddev", StandardDeviationEvaluator.class)
         .withFunctionName("mode", ModeEvaluator.class)
         .withFunctionName("logNormalDistribution", LogNormalDistributionEvaluator.class)
         .withFunctionName("zipFDistribution", ZipFDistributionEvaluator.class)
diff --git a/solr/solrj/src/java/org/apache/solr/client/solrj/io/eval/StandardDeviationEvaluator.java b/solr/solrj/src/java/org/apache/solr/client/solrj/io/eval/StandardDeviationEvaluator.java
new file mode 100644
index 00000000000..83132d09987
--- /dev/null
+++ b/solr/solrj/src/java/org/apache/solr/client/solrj/io/eval/StandardDeviationEvaluator.java
@@ -0,0 +1,59 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.solr.client.solrj.io.eval;
+
+import org.apache.solr.client.solrj.io.eval.OneValueWorker;
+import org.apache.solr.client.solrj.io.eval.RecursiveObjectEvaluator;
+import org.apache.solr.client.solrj.io.stream.expr.StreamExpression;
+import org.apache.solr.client.solrj.io.stream.expr.StreamFactory;
+
+import org.apache.commons.math3.stat.StatUtils;
+
+import java.io.IOException;
+import java.util.List;
+import java.util.Locale;
+
+public class StandardDeviationEvaluator extends RecursiveObjectEvaluator implements OneValueWorker {
+    protected static final long serialVersionUID = 1L;
+
+    public StandardDeviationEvaluator(StreamExpression expression, StreamFactory factory) throws IOException {
+        super(expression, factory);
+
+        if(1 != containedEvaluators.size()){
+            throw new IOException(String.format(Locale.ROOT,"Invalid expression %s - expecting exactly 1 value but found %d",expression,containedEvaluators.size()));
+        }
+    }
+
+    @Override
+    public Object doWork(Object value) throws IOException{
+        if(null == value){
+            throw new IOException(String.format(Locale.ROOT, "Unable to find %s(...) because the value is null", constructingFactory.getFunctionName(getClass())));
+        }
+        else if(value instanceof List){
+            List<Number> c = (List<Number>) value;
+            double[] data = new double[c.size()];
+            for(int i=0; i< c.size(); i++) {
+                data[i] = c.get(i).doubleValue();
+            }
+
+            return Math.sqrt(StatUtils.variance(data));
+        }
+        else{
+            throw new IOException(String.format(Locale.ROOT, "Unable to find %s(...) because the value is not a collection, instead a %s was found", constructingFactory.getFunctionName(getClass()), value.getClass().getSimpleName()));
+        }
+    }
+}
\ No newline at end of file
diff --git a/solr/solrj/src/java/org/apache/solr/client/solrj/io/eval/VarianceEvaluator.java b/solr/solrj/src/java/org/apache/solr/client/solrj/io/eval/VarianceEvaluator.java
new file mode 100644
index 00000000000..e7a3f11b7d6
--- /dev/null
+++ b/solr/solrj/src/java/org/apache/solr/client/solrj/io/eval/VarianceEvaluator.java
@@ -0,0 +1,59 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.solr.client.solrj.io.eval;
+
+import org.apache.solr.client.solrj.io.eval.OneValueWorker;
+import org.apache.solr.client.solrj.io.eval.RecursiveObjectEvaluator;
+import org.apache.solr.client.solrj.io.stream.expr.StreamExpression;
+import org.apache.solr.client.solrj.io.stream.expr.StreamFactory;
+
+import org.apache.commons.math3.stat.StatUtils;
+
+import java.io.IOException;
+import java.util.List;
+import java.util.Locale;
+
+public class VarianceEvaluator extends RecursiveObjectEvaluator implements OneValueWorker {
+    protected static final long serialVersionUID = 1L;
+
+    public VarianceEvaluator(StreamExpression expression, StreamFactory factory) throws IOException {
+        super(expression, factory);
+
+        if(1 != containedEvaluators.size()){
+            throw new IOException(String.format(Locale.ROOT,"Invalid expression %s - expecting exactly 1 value but found %d",expression,containedEvaluators.size()));
+        }
+    }
+
+    @Override
+    public Object doWork(Object value) throws IOException{
+        if(null == value){
+            throw new IOException(String.format(Locale.ROOT, "Unable to find %s(...) because the value is null", constructingFactory.getFunctionName(getClass())));
+        }
+        else if(value instanceof List){
+            List<Number> c = (List<Number>) value;
+            double[] data = new double[c.size()];
+            for(int i=0; i< c.size(); i++) {
+                data[i] = c.get(i).doubleValue();
+            }
+
+            return StatUtils.variance(data);
+        }
+        else{
+            throw new IOException(String.format(Locale.ROOT, "Unable to find %s(...) because the value is not a collection, instead a %s was found", constructingFactory.getFunctionName(getClass()), value.getClass().getSimpleName()));
+        }
+    }
+}
\ No newline at end of file
diff --git a/solr/solrj/src/test/org/apache/solr/client/solrj/io/TestLang.java b/solr/solrj/src/test/org/apache/solr/client/solrj/io/TestLang.java
index b43e9630da0..4df1aca32d2 100644
--- a/solr/solrj/src/test/org/apache/solr/client/solrj/io/TestLang.java
+++ b/solr/solrj/src/test/org/apache/solr/client/solrj/io/TestLang.java
@@ -75,7 +75,7 @@ public class TestLang extends SolrTestCase {
       "convexHull", "getVertices", "getBaryCenter", "getArea", "getBoundarySize","oscillate",
       "getAmplitude", "getPhase", "getAngularFrequency", "enclosingDisk", "getCenter", "getRadius",
       "getSupportPoints", "pairSort", "log10", "plist", "recip", "pivot", "ltrim", "rtrim", "export",
-      "zplot", "natural", "repeat", "movingMAD", "hashRollup", "noop"};
+      "zplot", "natural", "repeat", "movingMAD", "hashRollup", "noop", "var", "stddev"};
 
   @Test
   public void testLang() {
diff --git a/solr/solrj/src/test/org/apache/solr/client/solrj/io/stream/MathExpressionTest.java b/solr/solrj/src/test/org/apache/solr/client/solrj/io/stream/MathExpressionTest.java
index 6c7387b84e9..f38b90e4b80 100644
--- a/solr/solrj/src/test/org/apache/solr/client/solrj/io/stream/MathExpressionTest.java
+++ b/solr/solrj/src/test/org/apache/solr/client/solrj/io/stream/MathExpressionTest.java
@@ -3357,6 +3357,24 @@ public class MathExpressionTest extends SolrCloudTestCase {
     assertTrue(dotProduct.doubleValue() == 182);
   }
 
+  @Test
+  public void testVarianceAndStandardDeviation() throws Exception {
+    String cexpr = "let(echo=true,a=var(array(1,2,3,4,5)),b=stddev(array(2,2,2,2)))";
+    ModifiableSolrParams paramsLoc = new ModifiableSolrParams();
+    paramsLoc.set("expr", cexpr);
+    paramsLoc.set("qt", "/stream");
+    String url = cluster.getJettySolrRunners().get(0).getBaseUrl().toString()+"/"+COLLECTIONORALIAS;
+    TupleStream solrStream = new SolrStream(url, paramsLoc);
+    StreamContext context = new StreamContext();
+    solrStream.setStreamContext(context);
+    List<Tuple> tuples = getTuples(solrStream);
+    assertTrue(tuples.size() == 1);
+    Number variance = (Number)tuples.get(0).get("a");
+    assertTrue(variance.doubleValue() == 2.5);
+    Number stddev = (Number)tuples.get(0).get("b");
+    assertTrue(stddev.doubleValue() == 0);
+  }
+
   @Test
   public void testCache() throws Exception {
     String cexpr = "putCache(space1, key1, dotProduct(array(2,4,6,8,10,12),array(1,2,3,4,5,6)))";