Altuğ Çelikbilek (Turkish pronunciation: [ˈaɫtuː ˈtʃelicbilec]; born 7 September 1996) is a Turkish professional tennis player. He has a career high ATP singles ranking of world No. 154 achieved on 21 February 2022.^[1] He also has a career high ATP doubles ranking of No. 224, achieved on 25 July 2022.

Çelikbilek has won 2 ATP Challengers and 5 ITF singles titles and 11 ITF doubles titles. He is currently the No. 4 Turkish player.^[2]

He made his Grand Slam debut at the 2021 French Open in the qualifying competition.

Çelikbilek has represented Turkey at Davis Cup, where he has a win–loss record of 5–7.

In December 2024, he suffered a stroke whilst competing at the ITF M25 in Monastir, shortly afterwards he had to have surgery to remove a brain tumour.^[3]

Result	W–L	Date	Tournament	Tier	Surface	Opponent	Score
Loss	0–1	Nov 2016	Turkey F45, Antalya	Futures	Hard	Dmitry Popko	2–6, 5–7
Win	1–1	Feb 2017	Turkey F7, Antalya	Futures	Hard	Alexandar Lazov	4–6, 7–6(7–5), 6–4
Win	2–1	Apr 2018	Tunisia F16, Djerba	Futures	Hard	Yannick Mertens	6–7(4–7), 6–3, 6–4
Win	3–1	Oct 2018	Germany F16, Hamburg	Futures	Hard	Louis Wessels	6–2, 2–6, 6–4
Win	4–1	Feb 2019	M15 Monastir, Tunisia	WTT	Hard	Christoph Negritu	2–6, 6–4, 6–1
Win	5–1	May 2019	M15 Sozopol, Bulgaria	WTT	Hard	Alexander Donski	6–7(5–7), 6–3, 6–2
Loss	5–2	Nov 2019	M15 Monastir, Tunisia	WTT	Hard	Matija Pecotić	1–6, 1–6
Loss	5–3	Mar 2021	St.Petersburg, Russia	Challenger	Hard	Zizou Bergs	4–6, 6–3, 4–6
Win	6–3	Jul 2021	Porto, Portugal	Challenger	Hard	Quentin Halys	6–2, 6–1
Win	7–3	Jul 2021	Pozoblanco, Spain	Challenger	Hard	Cem İlkel	6–1, 6–7(2–7), 6–3
Win	8–3	Jul 2022	Porto, Portugal	Challenger	Hard	Christopher O'Connell	7–6(7–5), 3–1 ret.
Loss	8–4	Aug 2024	M15 Monastir, Tunisia	WTT	Hard	Yaroslav Demin	4–6, ret.
Win	9–4	Sep 2024	M15 Monastir, Tunisia	WTT	Hard	Carles Hernández	4–6, 6–3, 6–2

Result	W–L	Date	Tournament	Tier	Surface	Partner	Opponents	Score
Loss	0–1	Jun 2014	Turkey F21, Istanbul	Futures	Hard	Sarp Ağabigün	Cem Ilkel Efe Yurtacan	4–6, 6–7(5–7)
Loss	0–2	May 2015	Turkey F21, Antalya	Futures	Hard	Sefa Suluoglu	Ricardo Rodriguez Ruan Roelofse	2–6, 2–6
Loss	0–3	Jun 2015	Turkey F22, Bursa	Futures	Hard	Sefa Suluoglu	Alessandro Bega Davide Melchiorre	6–4, 5–7, [3–10]
Loss	0–4	Jul 2015	Turkey F28, Ankara	Futures	Clay	Tuna Altuna	Alessandro Bega Francesco Vilardo	4–6, 3–6
Win	1–4	Sep 2015	Turkey F35, Antalya	Futures	Hard	Sarp Ağabigün	Michal Konecny Miliaan Niesten	6–1, 7–6(7–5)
Loss	1–5	Dec 2015	Turkey F52, Antalya	Futures	Hard	Sarp Ağabigün	Tuna Altuna Cem Ilkel	6–4, 2–6, [6–10]
Loss	1–6	Feb 2016	Turkey F8, Antalya	Futures	Hard	Tuna Altuna	Sarp Ağabigün Marek Michalička	6–4, 3–6, [9–11]
Loss	1–7	May 2016	Turkey F18, Antalya	Futures	Hard	Sarp Ağabigün	Hugo Nys Miķelis Lībietis	2–6, 2–6
Win	2–7	May 2016	Turkey F20, Antalya	Futures	Hard	Sarp Ağabigün	Filipp Kekercheni Christoph Negritu	7–5, 6–3
Win	3–7	Aug 2016	Netherlands F5, Oldenzaal	Futures	Clay	Niels Lootsma	Antoine Hoang Benjamin Bonzi	6–3, 6–3
Win	4–7	Aug 2016	Netherlands F6, Rotterdam	Futures	Clay	Benjamin Bonzi	Bobbie De Goeijen Glenn Smits	6–1, 6–4
Win	5–7	Mar 2017	Turkey F11, Antalya	Futures	Clay	Mauricio Echazú	Ilya Vasilyev Victor Baluda	7–5, 6–4
Loss	5–8	Apr 2017	Turkey F15, Antalya	Futures	Clay	Sarp Ağabigün	Isak Arvidsson Pedro Sakamoto	3–6, 3–6
Loss	5–9	Jun 2017	Turkey F22, Istanbul	Futures	Clay	Sarp Ağabigün	Hugo Dellien Federico Zeballos	4–6, 6–4, [3–10]
Win	6–9	Jul 2017	Portugal F13, Idanha-a-Nova	Futures	Hard	Anil Yuksel	Jonathan Gray Clement Larrière	7–5, 6–2
Loss	6–10	Oct 2017	Germany F16, Hamburg	Futures	Hard	Anil Yuksel	Marvin Moeller Dan Added	7–6(7–3), 6–7(4–7), [2–10]
Loss	6–11	Nov 2017	Greece F9, Heraklion	Futures	Hard	Yaraslav Shyla	Marco Bortolotti Miles Seemann	6–7(1–7), 6–4, [7–10]
Win	7–11	Nov 2017	Greece F10, Heraklion	Futures	Hard	Christopher Díaz Figueroa	Marco Bortolotti Lucas Gomez	6–2, 6–2
Win	8–11	Jan 2018	Turkey F1, Antalya	Futures	Hard	Jakob Sude	Michal Konecny Patrik Rikl	7–6(7–4), 2–6, [10–4]
Win	9–11	Feb 2018	Turkey F6, Antalya	Futures	Hard	Cengiz Aksu	Omar Giacalone Pietro Rondoni	6–3, 3–6, [10–3]
Win	10–11	Mar 2018	Turkey F11, Antalya	Futures	Clay	Cem Ilkel	Rafael Matos Marcelo Zormann	1–6, 6–4, [10–8]
Loss	10–12	Apr 2018	Tunisia F15, Djerba	Futures	Hard	Juraj Masar	Dan Added Hugo Voljacques	1–6, 3–6
Loss	10–13	Apr 2018	Tunisia F16, Djerba	Futures	Hard	Domagoj Biljesko	Bernardo Saraiva Sem Verbeek	3–6, 1–6
Loss	10–14	Sep 2018	Tunisia F33, Monastir	Futures	Hard	Florent Diep	Ivan Liutarevich Skander Mansouri	3–6, 1–6
Loss	10–15	Oct 2018	Germany F15, Bad Salzdetfurth	Futures	Carpet	Hugo Voljacques	Mats Rosenkranz Petr Nouza	6–4, 3–6, [12–14]
Win	11–15	Oct 2018	Germany F16, Hamburg	Futures	Hard	Alexander Mannapov	Michael Geerts Christopher Heyman	6–3, 1–6, [10–7]
Win	12–15	Oct 2018	Germany F16, Hamburg	Futures	Hard	Alexander Mannapov	Michael Geerts Christopher Heyman	6–3, 1–6, [10–7]
Win	13–15	Jul 2022	Málaga, Spain	Challenger	Hard	Dmitry Popko	Daniel Cukierman Emilio Gómez	6–7(4–7), 6–4, [10–6]

• Altuğ Çelikbilek at the Association of Tennis Professionals
• Altuğ Çelikbilek at the International Tennis Federation
• Altuğ Çelikbilek at the Davis Cup