Alexandre "Sacha" Gaydamak (, born May 1976 in France) is a French and Israeli businessman. A member of the wealthy Gaydamak family, he is the only son of Arcadi Gaydamak.
In January 2006 he announced that he was following his father into association football club ownership by becoming co-owner of English Premier League club Portsmouth F.C. with Milan Mandarić.
His father was the owner of Israeli side Beitar Jerusalem. In July 2006 Alexandre Gaydamak became the sole owner of Portsmouth, although Mandarić remained at the club as non-executive chairman until later that year. Gaydamak owns a Luxembourg-based company, Belvia SARL and a British Virgin Islands company, Devondale Investments, which owned Portsmouth F.C.
On 21 July 2009, Gaydamak agreed to sell Portsmouth F.C. to Sulaiman Al Fahim in principle, and therefore stepped down from the board. He remained the owner of the club until the details of the sale had been finalised on 8 June 2009.
