diff --git a/docs/source/user-guide/latest/expressions.md b/docs/source/user-guide/latest/expressions.md
index fe42f49a47..e4a597beff 100644
--- a/docs/source/user-guide/latest/expressions.md
+++ b/docs/source/user-guide/latest/expressions.md
@@ -128,6 +128,7 @@ incompatible expressions.
 | BRound         | `bround`  | Yes               |                                   |
 | Ceil           | `ceil`    | Yes               |                                   |
 | Cos            | `cos`     | Yes               |                                   |
+| Cot            | `cot`     | Yes               |                                   |
 | Divide         | `/`       | Yes               |                                   |
 | Exp            | `exp`     | Yes               |                                   |
 | Expm1          | `expm1`   | Yes               |                                   |
diff --git a/fuzz-testing/src/main/scala/org/apache/comet/fuzz/Meta.scala b/fuzz-testing/src/main/scala/org/apache/comet/fuzz/Meta.scala
index 5e921df26c..2e29cb930b 100644
--- a/fuzz-testing/src/main/scala/org/apache/comet/fuzz/Meta.scala
+++ b/fuzz-testing/src/main/scala/org/apache/comet/fuzz/Meta.scala
@@ -114,6 +114,7 @@ object Meta {
     createUnaryNumericFunction("sin"),
     createUnaryNumericFunction("sqrt"),
     createUnaryNumericFunction("tan"),
+    createUnaryNumericFunction("cot"),
     createUnaryNumericFunction("ceil"),
     createUnaryNumericFunction("floor"),
     createFunctionWithInputTypes("unary_minus", Seq(SparkNumericType)))
diff --git a/spark/src/main/scala/org/apache/comet/serde/QueryPlanSerde.scala b/spark/src/main/scala/org/apache/comet/serde/QueryPlanSerde.scala
index 3e0e837c9c..1a67b9f245 100644
--- a/spark/src/main/scala/org/apache/comet/serde/QueryPlanSerde.scala
+++ b/spark/src/main/scala/org/apache/comet/serde/QueryPlanSerde.scala
@@ -128,6 +128,7 @@ object QueryPlanSerde extends Logging with CometExprShim {
     classOf[Sqrt] -> CometScalarFunction("sqrt"),
     classOf[Subtract] -> CometSubtract,
     classOf[Tan] -> CometScalarFunction("tan"),
+    classOf[Cot] -> CometScalarFunction("cot"),
     classOf[UnaryMinus] -> CometUnaryMinus,
     classOf[Unhex] -> CometUnhex,
     classOf[Abs] -> CometAbs)
diff --git a/spark/src/test/scala/org/apache/comet/CometExpressionSuite.scala b/spark/src/test/scala/org/apache/comet/CometExpressionSuite.scala
index e4fb08101d..88ba20f8c9 100644
--- a/spark/src/test/scala/org/apache/comet/CometExpressionSuite.scala
+++ b/spark/src/test/scala/org/apache/comet/CometExpressionSuite.scala
@@ -1352,7 +1352,8 @@ class CometExpressionSuite extends CometTestBase with AdaptiveSparkPlanHelper {
           "log2",
           "sin",
           "sqrt",
-          "tan")) {
+          "tan",
+          "cot")) {
         val (_, cometPlan) =
           checkSparkAnswerAndOperatorWithTol(sql(s"SELECT $expr(_1), $expr(_2) FROM tbl"))
         val cometProjectExecs = collect(cometPlan) { case op: CometProjectExec =>