Ardingly College () is a fee-charging boarding and day school in the English public school tradition located near Ardingly, West Sussex, England. The school is a member of the Headmasters' and Headmistresses' Conference and of the Woodard Corporation of independent schools and as such has a strong Anglo-Catholic tradition. It was originally a boarding school for boys, and became fully co-educational in 1982.

Ardingly played an important role in providing infantry throughout the 20th century conflicts, with around 1,200 Ardingly pupils going on to fight in the First World War, 146 of whom were killed, along with two former members of staff. In addition, 88 Old Ardinians died in World War II; their names being recorded in a book of remembrance.

The school's former pupils – or "Old Ardinians" – include four Conservative MPs; satirist Ian Hislop; actor Terry-Thomas; Formula One World Champion Mike Hawthorn; author Neil Gaiman; Interscan inventor John Paul Wild; and Allard Motor Company founder Sydney Allard.