The Mac Diarmida Stakes is a Grade II American Thoroughbred horse race for horses four-years-old and older run over a distance of one-and-three-eighth miles (11 furlongs) on the turf, annually in late February or early March at Gulfstream Park in Hallandale Beach, Florida. The current purse is $200,000.^[1]

The event was inaugurated on 16 January 1995 for three-year-olds at a distance of 1 mile and 70 yards and was held on the dirt track.^[2]

The race was named in honor of Florida-bred Mac Diarmida who was the American Champion Male Turf Horse of 1978.^[3] The following year, in 1996 the event was lengthened slightly to one-and-one-sixteenth miles and run on the turf.

It was run as a handicap from 1997 through 2008 but is now run under allowance weight conditions. The event was upgraded to Grade III in 1997.^[4] In 1997, wet weather forced the race to be moved from the turf course to the main dirt track and set at a distance of one-and-one-quarter miles with conditions changed to allow horses four years old and older. In 1998 the race was changed to its present distance of one-and-three-eighths miles.^[1]

The race was not run in 2001.^[1] The event was upgraded once again in 2007 to Grade II.^[4] The event was originally held in January but since 2017 has been run in late February or early March.^[1]

Speed record

• 1+3⁄8 miles — 2:10.87 Stream of Gold (IRE) (2008)

Margins

• 4+1⁄4 lengths — Panama City (1999)

Most wins

• 2 - Presious Passion (2009, 2010)
• 2 - Zulu Alpha – (2019, 2020)

Most wins by an owner

• 3 - Michael M. Hui (2019, 2020, 2023)

Most wins by a jockey

• 4 - Jerry Bailey (1997, 1998, 1999, 2002)

Most wins by a trainer

• 5 - Michael J. Maker (2019, 2020, 2022, 2023, 2024)

List of American and Canadian Graded races

• 2020–21 Gulfstream Park Media Guide