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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. Her career-high in doubles is 326, which she reached on 13 September 2004. 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. She finally retired from professional tennis in 2014.

Result	No.	Date	Tournament	Surface	Opponent	Score
Loss	1.	18 June 2000	ITF Kędzierzyn-Koźle, Poland	Clay	Zuzana Ondrášková	5–7, 4–6
Win	2.	25 May 2003	ITF Lviv, Ukraine	Clay	Mariya Koryttseva	6–4, 6–0
Win	3.	8 June 2003	ITF Ankara, Turkey	Clay	Monika Schneider	6–4, 6–4
Win	4.	13 September 2004	ITF Tbilisi, Georgia	Clay	Katarína Kachlíková	6–2, 6–2
Loss	5.	1 May 2005	ITF Lafayette, United States	Clay	Edina Gallovits-Hall	2–6, 6–7(6–8)
Win	6.	8 May 2005	ITF Raleigh, United States	Clay	Mary Gambale	6–3, 6–1

Result	No.	Date	Tournament	Surface	Partner	Opponents	Score
Loss	1.	18 June 2000	ITF Kędzierzyn-Koźle, Poland	Clay	Elena Kovalchuk	Alona Bondarenko Valeria Bondarenko	4–6, 2–6
Loss	2.	1 June 2003	ITF Warsaw, Poland	Clay	Iryna Brémond	Alona Bondarenko Valeria Bondarenko	3–6, 4–6
Win	3.	8 June 2003	ITF Ankara, Turkey	Clay	Svetlana Mossiakova	Gabriela Velasco Andreu Julia Efremova	6–4, 6–1
Loss	4.	8 September 2003	ITF Turin, Italy	Clay	Yuliana Fedak	Mervana Jugić-Salkić Darija Jurak	4–6, 2–6

• Olga Lazarchuk at the Women's Tennis Association
• Olga Lazarchuk at the International Tennis Federation