Garrison Creek was a short stream about 7.7 kilometres (4.8 miles) long that flowed southeast into the west side of Toronto Harbour in Ontario, Canada.

[1] It has been largely covered over and filled in, but geographical traces of the creek can still be found, including the natural amphitheatre known as Christie Pits and the off-leash dog "bowl" of Trinity Bellwoods Park.

The unusual courses of Niagara Street (north of Fort York) and Vaughan Road (St. Clair and Bathurst area) indicate that they were once trails following the banks of the creek.

[2] In 2013 particularly strong rainstorms caused the storm sewers that replaced Garrison Creek to flood, at Christie Pits, Trinity Bellwoods Park, and a railway underpass at King Street and Atlantic Avenue.

[3] Both Christie Pits and Trinity Bellwoods Park are over the original Garrison Creek Ravine, while the King and Atlantic intersection is over the course of Asylum Stream, a tributary that ran from just northwest of Fort York to Lisgar Street and Queen Street West near the former Provincial Asylum.