is a Scottish football coach and former player.

He began his career at Dundee United in 1990, and moved to Rangers in 1993 for what was then a British transfer record fee. He spent the remainder of his career in England, moving to Everton in 1994 before a stint with Newcastle United between 1998 and 2000, after which he returned to Everton, where he retired in 2006.

During his career, Ferguson won the FA Cup with Everton in 1995. He was capped for Scotland seven times, playing at UEFA Euro 1992, but made himself unavailable for selection for the national team from 1997 due to a dispute with the Scottish Football Association (SFA). He has scored more goals than any other Scottish player in England's Premier League since its creation in 1992.

Ferguson's aggressive style of play resulted in a career total of nine red cards, as well as a three-month prison sentence following an on-field assault of Raith Rovers' John McStay in 1994. Eight of those red cards were in the English Premier League, where he holds the joint record for dismissals alongside Patrick Vieira and Richard Dunne. He is known by the nicknames \"Big Dunc\" and \"Duncan Disorderly\".

Ferguson was promoted to the first-team coaching staff at Everton in 2014. Following the dismissal of Everton manager Marco Silva in December 2019, he was named as the team's caretaker manager until Silva's replacement Carlo Ancelotti was appointed manager a few weeks later, at which point Ferguson was made assistant manager. Ferguson left Everton after a second stint as caretaker manager in 2022. After a brief spell as Forest Green Rovers manager, he was appointed manager of Inverness Caledonian Thistle in September 2023 and was sacked when the club went into administration in October 2024.