Stewart Mackie Houston (born 20 August 1949) is a Scottish former football player and coach who played as a left-back.
Born in Dunoon, he began his professional career in 1967 with Chelsea, before moving across London to Brentford in 1972.
After 18 months with Brentford, he joined Manchester United, where he spent seven years, making 250 appearances.
He then spent three years with Sheffield United, and another three with Colchester United to end his career.
He also made one appearance for the Scotland national team in 1975.
After he retired from playing, Houston moved into coaching.
In 1990, he was appointed as George Graham's assistant at Arsenal.
He took over as the club's caretaker manager when Graham was sacked in 1995, and again in 1996 after the sacking of Graham's replacement, Bruce Rioch.
At the end of his tenure with Arsenal, he took over as manager of Queens Park Rangers, where he appointed Rioch as his assistant, but the pair were sacked after failing to get the club promoted back to the Premier League.
He then had spells as the first-team coach at Ipswich Town, Tottenham Hotspur and Walsall.