diff --git a/corpus/drop_function_statement.txt b/corpus/drop_function_statement.txt
new file mode 100644
index 0000000..2ea047d
--- /dev/null
+++ b/corpus/drop_function_statement.txt
@@ -0,0 +1,102 @@
+================================================================================
+basic
+================================================================================
+drop function foo(bigint, text);
+--------------------------------------------------------------------------------
+
+(source_file
+  (drop_function_statement
+    (drop_function_item
+      (identifier)
+      (identifier)
+      (identifier))))
+
+================================================================================
+many at once
+================================================================================
+drop function foo(bigint, text), foo(bigint);
+--------------------------------------------------------------------------------
+
+(source_file
+  (drop_function_statement
+    (drop_function_item
+      (identifier)
+      (identifier)
+      (identifier))
+    (drop_function_item
+      (identifier)
+      (identifier))))
+
+================================================================================
+without args
+================================================================================
+drop function foo;
+--------------------------------------------------------------------------------
+
+(source_file
+  (drop_function_statement
+    (drop_function_item
+      (identifier))))
+
+================================================================================
+with no args
+================================================================================
+drop function foo();
+--------------------------------------------------------------------------------
+
+(source_file
+  (drop_function_statement
+    (drop_function_item
+      (identifier))))
+
+================================================================================
+cascade
+================================================================================
+drop function foo(bigint) cascade;
+--------------------------------------------------------------------------------
+
+(source_file
+  (drop_function_statement
+    (drop_function_item
+      (identifier)
+      (identifier))))
+
+================================================================================
+restrict
+================================================================================
+drop function foo(bigint) restrict;
+--------------------------------------------------------------------------------
+
+(source_file
+  (drop_function_statement
+    (drop_function_item
+      (identifier)
+      (identifier))))
+
+================================================================================
+if exists
+================================================================================
+drop function if exists foo();
+--------------------------------------------------------------------------------
+
+(source_file
+  (drop_function_statement
+    (drop_function_item
+      (if_exists)
+      (identifier))))
+
+================================================================================
+with argnames
+================================================================================
+drop function if exists foo(bar text, bigint);
+--------------------------------------------------------------------------------
+
+(source_file
+  (drop_function_statement
+    (drop_function_item
+      (if_exists)
+      (identifier)
+      (var_declaration
+        (identifier)
+        (identifier))
+      (identifier))))
diff --git a/grammar.js b/grammar.js
index c7686db..c12b497 100644
--- a/grammar.js
+++ b/grammar.js
@@ -45,6 +45,7 @@ module.exports = grammar({
     _statement: $ => choice(
       $.psql_statement,
       $.create_function_statement,
+      $.drop_function_statement,
       $.create_table_statement,
       $.create_schema_statement,
       $.create_type_statement,
@@ -59,6 +60,24 @@ module.exports = grammar({
       $.do_block,
     ),
 
+    drop_function_statement: $ => seq(
+      kw("drop"), kw("function"),
+      commaSep1($.drop_function_item),
+      optional(choice(kw("cascade"), kw("restrict")))
+    ),
+
+    drop_function_item: $ => seq(
+      optional($.if_exists),
+      $.identifier,
+      optional(
+        seq(
+          "(",
+          commaSep(
+            choice($.var_declaration, $._type,)
+          ),
+          ")",
+    ))),
+
     create_type_statement: $ => seq(
       kw("create"), kw("type"), $.identifier, optional(choice(
         seq(kw("as"), kw("enum"), "(", commaSep1($.string), ")"),