HSDC is a Further education college located in Waterlooville, Hampshire, England. The college was formed on 1 August 2017 following a merger of South Downs College and Havant Sixth Form College.

The College subsequently merged with Alton College on 1 March 2019, to become HSDC, composed of three campuses; HSDC Alton, HSDC Havant and HSDC South Downs. The College provision includes nearly 40 A Level subjects across the three campuses as well as vocational courses including T Levels (from September 2020), UAL and BTEC qualifications and apprenticeships delivered in partnership with leading local and national businesses.

The college has just under 7,500 students, with nearly 4,200 of these being full-time students, and 380 apprentices.