Fergus "Gus" Greensmith (born 26 December 1996) is a British rally driver.

Greensmith's family owns fuel and lubricants distributor Crown Oil.

As a karter who went to school in Manchester he appeared in the CIK-FIA U18 World Karting Championship in 2012, racing alongside Charles Leclerc, Ben Barnicoat and Joey Mawson among others.

He competed full-time in the 2017 World Rally Championship-2 on an M-Sport Ford Fiesta R5, finishing 11th in the overall standings.

Greensmith earned his first WRC stage victory at the 2022 Monte Carlo Rally.