Samuel Luke Johnstone (born 25 March 1993) is an English professional footballer who plays as goalkeeper for Premier League club West Bromwich Albion.
A product of the Manchester United Academy, he has spent time on loan with Oldham Athletic, Scunthorpe United, Walsall, Yeovil Town, Doncaster Rovers, Preston North End and Aston Villa. He was an England youth international, winning caps at under-16, under-17, under-19 and under-20 levels. He is the son of Glenn Johnstone, a former professional footballer who played as a goalkeeper for Preston North End in the early 1990s.
On 3 July 2018, Johnstone signed a four-year contract with newly-relegated Championship side West Bromwich Albion, for a transfer fee reported to be in the region of £6.5 million. Upon joining the Baggies, he inherited the number 1 shirt, taking over from previous first-choice goalkeeper Ben Foster, who left to join Watford, after West Brom’s relegation from the Premier League. Johnstone was part of the West Bromwich Albion team that lost to Aston Villa in the EFL Championship play-off semi finals on penalties in May 2019. However, the following season, Sam Johnstone helped the club gain automatic promotion to the Premier League for the 2020–21 season.