Olga Yuriyivna Ianchuk (Ukrainian: Ольга Юріївна Янчук, born 29 March 1995) is a Ukrainian former professional tennis player.

Ianchuk has career-high WTA rankings of 213 in singles, achieved in August 2017, and 254 in doubles, reached in October 2015. In her career, she won eleven singles and four doubles titles on tournaments of the ITF Circuit.

Ianchuk made her WTA Tour main-draw debut at the 2015 Baku Cup in the doubles event, partnering Oleksandra Korashvili.

Her older sister Elizaveta Ianchuk is also a professional tennis player.

Result	No.	Date	Tournament	Surface	Opponent	Score
Win	1.	Oct 2011	ITF Minsk, Belarus	Carpet	Julia Valetova	6–3, 4–6, 6–4
Win	2.	Oct 2012	ITF Antalya, Turkey	Clay	Demi Schuurs	6–2, 2–6, 6–3
Win	3.	Oct 2012	ITF Antalya	Clay	Diana Buzean	3–6, 6–4, 6–4
Win	4.	May 2013	ITF Antalya	Hard	Zuzana Zlochová	6–3, 6–3
Win	5.	May 2013	ITF Antalya	Hard	Martina Kubiciková	6–3, 7–6(4)
Win	6.	Feb 2014	ITF Stockholm, Sweden	Hard (i)	Kateřina Vaňková	6–0, 6–0
Loss	1.	Jun 2014	ITF Bol, Croatia	Clay	Nadia Podoroska	3–6, 6–2, 2–6
Loss	2.	Sep 2014	Batumi Ladies Open, Georgia	Hard	An-Sophie Mestach	2–6, 0–6
Loss	3.	Dec 2014	ITF İstanbul, Turkey	Hard (i)	Jana Fett	2–6, 4–6
Win	7.	Mar 2015	ITF Amiens, France	Clay (i)	Alizé Lim	3–6, 6–3, 6–4
Win	8.	Mar 2015	ITF Gonesse, France	Clay (i)	Michaela Hončová	3–6, 7–5, 6–3
Win	9.	Mar 2017	ITF Heraklion, Greece	Clay	Miriam Kolodziejová	6–3, 6–2
Loss	4.	Apr 2017	ITF Qarshi, Uzbekistan	Hard	Polina Monova	6–4, 3–6, 3–6
Loss	5.	Jun 2017	ITF Warsaw, Poland	Clay	Martina Trevisan	2–6, 4–6
Win	10.	Jul 2017	ITF Moscow, Russia	Clay	Valentyna Ivakhnenko	4–6, 6–0, 7–6(5)
Loss	6.	Sep 2017	ITF Kyiv, Ukraine	Clay	Sviatlana Pirazhenka	4–6, 4–6
Win	11.	Aug 2018	ITF Warsaw, Poland	Clay	Victoria Bosio	6–3, 4–6, 6–3

Outcome	No.	Date	Tournament	Surface	Partner	Opponents	Score
Runner-up	1.	3 October 2011	ITF Yerevan, Armenia	Clay	Elizaveta Ianchuk	Tatia Mikadze Sofia Shapatava	1–6, 4–6
Runner-up	2.	31 October 2011	ITF Minsk, Belarus	Carpet (i)	Lidziya Marozava	Polina Monova Anna Smolina	3–6, 4–6
Winner	1.	13 May 2013	ITF Antalya, Turkey	Hard	Darya Lebesheva	Nozomi Fujioka Hirono Watanabe	3–6, 7–5, [10–8]
Winner	2.	27 May 2013	ITF Adana, Turkey	Hard	Zuzana Zlochová	Sultan Gonen Julia Stamatova	6–2, 7–5
Runner-up	3.	29 July 2013	ITF Rovereto, Italy	Clay	Chantal Škamlová	Martina Caregaro Anna Floris	6–3, 4–6, [6–10]
Runner-up	4.	12 October 2013	ITF Moscow, Russia	Clay	Anett Kontaveit	Anna Shkudun Alyona Sotnikova	3–6, 4–6
Winner	3.	20 January 2014	ITF Kaarst, Germany	Carpet	Nastja Kolar	Vivian Heisen Linda Prenkovic	7–5, 6–3
Runner-up	5.	17 February 2014	ITF Helsingborg, Sweden	Hard	Jasmina Tinjic	Cornelia Lister Lisanne van Riet	4–6, 3–6
Winner	4.	12 May 2014	ITF Bastad, Sweden	Clay	Carolin Daniels	Anna Smolina Liubov Vasilyeva	6–4, 6–3
Runner-up	6.	19 May 2014	ITF Bol, Croatia	Clay	Christina Shakovets	Emma Laine Eugeniya Pashkova	4–6, 0–6
Runner-up	7.	2 June 2014	ITF Bol, Croatia	Clay	Christina Shakovets	Lenka Kunčíková Karolína Stuchlá	6–0, 1–6, [8–10]
Runner-up	8.	8 November 2014	ITF Sharm El Sheikh, Egypt	Hard	Nastja Kolar	Antonia Lottner Laura Siegemund	1–6, 1–6
Runner-up	9.	15 March 2015	ITF Amiens, France	Clay (i)	Elizaveta Ianchuk	Ilka Csoregi Eleni Daniilidou	1–6, 4–6
Runner-up	10.	22 March 2015	ITF Gonesse, France	Clay (i)	Elizaveta Ianchuk	Ágnes Bukta Oana Georgeta Simion	4–6, 6–3, [6–10]
Runner-up	11.	3 May 2015	ITF Charlottesville, U.S.	Clay	Irina Khromacheva	Françoise Abanda Maria Sanchez	1–6, 3–6
Runner-up	12.	31 May 2015	ITF Moscow, Russia	Clay	Daria Kasatkina	Carolin Daniels Alyona Sotnikova	2–6, 6–7(10)
Runner-up	13.	13 June 2015	ITF Minsk, Belarus	Clay	Daria Kasatkina	Valentyna Ivakhnenko Polina Monova	6–4, 0–6, [10–12]
Runner-up	14.	18 September 2015	ITF Bucha, Ukraine	Clay	Victoria Kan	Alona Fomina Oleksandra Korashvili	4–6, 3–6
Runner-up	15.	25 September 2015	ITF Bucha, Ukraine	Clay	Anastasiya Vasylyeva	Ekaterine Gorgodze Sofia Shapatava	5–7, 2–6
Runner-up	16.	20 August 2016	ITF Leipzig, Germany	Clay	Michaela Hončová	Nicola Geuer Anna Klasen	6–7(4), 5–7
Runner-up	17.	25 March 2017	ITF Heraklion, Greece	Clay	Despina Papamichail	Mira Antonitsch Karman Kaur Thandi	0–6, 3–6

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