Olga Viktorovna Lazarchuk (Ukrainian: Ольга Вікторівна Лазарчук; born 3 December 1981) is a Ukrainian former tennis player.

Her highest WTA singles ranking is 146, which she reached on 9 May 2005.

Lazarchuk who's favourite court was clay, won four singles titles and one doubles title on the ITF Women's Circuit.

She took part in the 2005 Hyderabad Open qualifying but retired in the second round to Mandy Minella.

Lazarchuk played her last match on the circuit 2005.