Gulf Brook

{{Use American English|date=February 2025}}

{{Infobox river

| name = Gulf Brook

| name_native =

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| pushpin_map = USA New York#USA

| pushpin_map_size =

| pushpin_map_caption= Location of the mouth of Gulf Brook in New York

| subdivision_type1 = Country

| subdivision_name1 = United States

| subdivision_type2 = State

| subdivision_name2 = New York

| subdivision_type3 = County

| subdivision_name3 = Delaware

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| source1 =

| source1_location =

| source1_coordinates= {{coord|42.0591667|-74.8438889|format=dms}}

| source1_elevation =

| mouth = Holliday Brook

| mouth_location =

| mouth_coordinates = {{coord|42.0556436|-74.8698831|format=dms|display=inline,title}}{{cite gnis

| id = 951912

| name = Gulf Brook

| accessdate = 2018-09-09}}

| mouth_elevation = {{convert|1457|ft|abbr=on}}

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Gulf Brook is a river in Delaware County in New York. It flows into Holliday Brook east-southeast of Downsville.