diff --git a/builtins.go b/builtins.go
index 5cc920f..c727175 100644
--- a/builtins.go
+++ b/builtins.go
@@ -1885,6 +1885,22 @@ func builtinNative(i *interpreter, name value) (value, error) {
 	return &valueNull{}, nil
 }
 
+func builtinSum(i *interpreter, arrv value) (value, error) {
+	arr, err := i.getArray(arrv)
+	if err != nil {
+		return nil, err
+	}
+	sum := 0.0
+	for _, elem := range arr.elements {
+		elemValue, err := i.evaluateNumber(elem)
+		if err != nil {
+			return nil, err
+		}
+		sum += elemValue.value
+	}
+	return makeValueNumber(sum), nil
+}
+
 // Utils for builtins - TODO(sbarzowski) move to a separate file in another commit
 
 type builtin interface {
@@ -2190,6 +2206,7 @@ var funcBuiltins = buildBuiltinMap([]builtin{
 	&unaryBuiltin{name: "decodeUTF8", function: builtinDecodeUTF8, params: ast.Identifiers{"arr"}},
 	&generalBuiltin{name: "sort", function: builtinSort, params: []generalBuiltinParameter{{name: "arr"}, {name: "keyF", defaultValue: functionID}}},
 	&unaryBuiltin{name: "native", function: builtinNative, params: ast.Identifiers{"x"}},
+	&unaryBuiltin{name: "sum", function: builtinSum, params: ast.Identifiers{"arr"}},
 
 	// internal
 	&unaryBuiltin{name: "$objectFlatMerge", function: builtinUglyObjectFlatMerge, params: ast.Identifiers{"x"}},
diff --git a/linter/internal/types/stdlib.go b/linter/internal/types/stdlib.go
index db8925d..2ad8bbe 100644
--- a/linter/internal/types/stdlib.go
+++ b/linter/internal/types/stdlib.go
@@ -137,6 +137,7 @@ func prepareStdlib(g *typeGraph) {
 		"flattenArrays": g.newSimpleFuncType(anyArrayType, "arrs"),
 		"sort":          g.newFuncType(anyArrayType, []ast.Parameter{required("arr"), optional("keyF")}),
 		"uniq":          g.newFuncType(anyArrayType, []ast.Parameter{required("arr"), optional("keyF")}),
+		"sum":           g.newSimpleFuncType(numberType, "arr"),
 
 		// Sets
 
diff --git a/testdata/builtinSum.golden b/testdata/builtinSum.golden
new file mode 100644
index 0000000..1e8b314
--- /dev/null
+++ b/testdata/builtinSum.golden
@@ -0,0 +1 @@
+6
diff --git a/testdata/builtinSum.jsonnet b/testdata/builtinSum.jsonnet
new file mode 100644
index 0000000..e011845
--- /dev/null
+++ b/testdata/builtinSum.jsonnet
@@ -0,0 +1 @@
+std.sum([1,2,3])
\ No newline at end of file
diff --git a/testdata/builtinSum.linter.golden b/testdata/builtinSum.linter.golden
new file mode 100644
index 0000000..e69de29