Altuğ Çelikbilek (; born 7 September 1996) is a Turkish inactive professional tennis player. He has a career high ATP singles ranking of world No. 154 achieved on 21 February 2022. 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.
Çelikbilek has represented Turkey at Davis Cup, where he has a win–loss record of 5–7.
| {class=wikitable style=font-size:97% !Legend |
| ATP Challenger Tour (3–1) |
| ITF Futures/WTT (6–3) |
| Hard (9–4) |
| Clay (0–0) |
| Loss | 0–1 | Turkey F45, Antalya | Futures | Hard | Dmitry Popko | 2–6, 5–7 | |
| Win | 1–1 | Turkey F7, Antalya | Futures | Hard | Alexandar Lazov | 4–6, 7–6(7–5), 6–4 | |
| Win | 2–1 | Tunisia F16, Djerba | Futures | Hard | Yannick Mertens | 6–7(4–7), 6–3, 6–4 | |
| Win | 3–1 | Germany F16, Hamburg | Futures | Hard | Louis Wessels | 6–2, 2–6, 6–4 | |
| Win | 4–1 | M15 Monastir, Tunisia | WTT | Hard | Christoph Negritu | 2–6, 6–4, 6–1 | |
| Win | 5–1 | M15 Sozopol, Bulgaria | WTT | Hard | Alexander Donski | 6–7(5–7), 6–3, 6–2 | |
| Loss | 5–2 | M15 Monastir, Tunisia | WTT | Hard | Matija Pecotić | 1–6, 1–6 | |
| Loss | 5–3 | St.Petersburg, Russia | Challenger | Hard | Zizou Bergs | 4–6, 6–3, 4–6 | |
| Win | 6–3 | Porto, Portugal | Challenger | Hard | Quentin Halys | 6–2, 6–1 | |
| Win | 7–3 | Pozoblanco, Spain | Challenger | Hard | Cem İlkel | 6–1, 6–7(2–7), 6–3 | |
| Win | 8–3 | Porto, Portugal | Challenger | Hard | Christopher O'Connell | 7–6(7–5), 3–1 ret. | |
| Loss | 8–4 | M15 Monastir, Tunisia | WTT | Hard | Yaroslav Demin | 4–6, ret. | |
| Win | 9–4 | M15 Monastir, Tunisia | WTT | Hard | Carles Hernández | 4–6, 6–3, 6–2 |
| {class=wikitable style=font-size:97% !Legend |
| ATP Challenger Tour (1–0) |
| ITF Futures/WTT (12–15) |
| Hard (9–11) |
| Clay (4–3) |
| Grass (0–0) |
| Carpet (0–1) |
| Loss | 0–1 | Turkey F21, Istanbul | Futures | Hard | Sarp Ağabigün | Cem Ilkel Efe Yurtacan | 4–6, 6–7(5–7) | |
| Loss | 0–2 | Turkey F21, Antalya | Futures | Hard | Sefa Suluoglu | Ricardo Rodriguez Ruan Roelofse | 2–6, 2–6 | |
| Loss | 0–3 | Turkey F22, Bursa | Futures | Hard | Sefa Suluoglu | Alessandro Bega Davide Melchiorre | 6–4, 5–7, 3–10 | |
| Loss | 0–4 | Turkey F28, Ankara | Futures | Clay | Tuna Altuna | Alessandro Bega Francesco Vilardo | 4–6, 3–6 | |
| Win | 1–4 | Turkey F35, Antalya | Futures | Hard | Sarp Ağabigün | Michal Konecny Miliaan Niesten | 6–1, 7–6(7–5) | |
| Loss | 1–5 | Turkey F52, Antalya | Futures | Hard | Sarp Ağabigün | Tuna Altuna Cem Ilkel | 6–4, 2–6, 6–10 | |
| Loss | 1–6 | Turkey F8, Antalya | Futures | Hard | Tuna Altuna | Sarp Ağabigün Marek Michalička | 6–4, 3–6, 9–11 | |
| Loss | 1–7 | Turkey F18, Antalya | Futures | Hard | Sarp Ağabigün | Hugo Nys Miķelis Lībietis | 2–6, 2–6 | |
| Win | 2–7 | Turkey F20, Antalya | Futures | Hard | Sarp Ağabigün | Filipp Kekercheni Christoph Negritu | 7–5, 6–3 | |
| Win | 3–7 | Netherlands F5, Oldenzaal | Futures | Clay | Niels Lootsma | Antoine Hoang Benjamin Bonzi | 6–3, 6–3 | |
| Win | 4–7 | Netherlands F6, Rotterdam | Futures | Clay | Benjamin Bonzi | Bobbie De Goeijen Glenn Smits | 6–1, 6–4 | |
| Win | 5–7 | Turkey F11, Antalya | Futures | Clay | Mauricio Echazú | Ilya Vasilyev Victor Baluda | 7–5, 6–4 | |
| Loss | 5–8 | Turkey F15, Antalya | Futures | Clay | Sarp Ağabigün | Isak Arvidsson Pedro Sakamoto | 3–6, 3–6 | |
| Loss | 5–9 | Turkey F22, Istanbul | Futures | Clay | Sarp Ağabigün | Hugo Dellien Federico Zeballos | 4–6, 6–4, 3–10 | |
| Win | 6–9 | Portugal F13, Idanha-a-Nova | Futures | Hard | Anil Yuksel | Jonathan Gray Clement Larrière | 7–5, 6–2 | |
| Loss | 6–10 | Germany F16, Hamburg | Futures | Hard | Anil Yuksel | Marvin Moeller Dan Added | 7–6(7–3), 6–7(4–7), 2–10 | |
| Loss | 6–11 | Greece F9, Heraklion | Futures | Hard | Yaraslav Shyla | Marco Bortolotti Miles Seemann | 6–7(1–7), 6–4, 7–10 | |
| Win | 7–11 | Greece F10, Heraklion | Futures | Hard | Christopher Díaz Figueroa | Marco Bortolotti Lucas Gomez | 6–2, 6–2 | |
| Win | 8–11 | Turkey F1, Antalya | Futures | Hard | Jakob Sude | Michal Konecny Patrik Rikl | 7–6(7–4), 2–6, 10–4 | |
| Win | 9–11 | Turkey F6, Antalya | Futures | Hard | Cengiz Aksu | Omar Giacalone Pietro Rondoni | 6–3, 3–6, 10–3 | |
| Win | 10–11 | Turkey F11, Antalya | Futures | Clay | Cem Ilkel | Rafael Matos Marcelo Zormann | 1–6, 6–4, 10–8 | |
| Loss | 10–12 | Tunisia F15, Djerba | Futures | Hard | Juraj Masar | Dan Added Hugo Voljacques | 1–6, 3–6 | |
| Loss | 10–13 | Tunisia F16, Djerba | Futures | Hard | Domagoj Biljesko | Bernardo Saraiva Sem Verbeek | 3–6, 1–6 | |
| Loss | 10–14 | Tunisia F33, Monastir | Futures | Hard | Florent Diep | Ivan Liutarevich Skander Mansouri | 3–6, 1–6 | |
| Loss | 10–15 | Germany F15, Bad Salzdetfurth | Futures | Carpet | Hugo Voljacques | Mats Rosenkranz Petr Nouza | 6–4, 3–6, 12–14 | |
| Win | 11–15 | Germany F16, Hamburg | Futures | Hard | Alexander Mannapov | Michael Geerts Christopher Heyman | 6–3, 1–6, 10–7 | |
| Win | 12–15 | Germany F16, Hamburg | Futures | Hard | Alexander Mannapov | Michael Geerts Christopher Heyman | 6–3, 1–6, 10–7 | |
| Win | 13–15 | Málaga, Spain | Challenger | Hard | Dmitry Popko | Daniel Cukierman Emilio Gómez | 6–7(4–7), 6–4, 10–6 |
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