| Challenger Gwangju | 04/14 04:45 | 14 | August Holmgren v Duckhee Lee | 5-7,5-7 | |
| Challenger Busan | 04/07 01:00 | 14 | August Holmgren v Yuki Mochizuki | 4-6,2-6 | |
| ITF M25 Calabasas | 03/21 19:40 | 26 | August Holmgren v Karue Sell | 4-6,3-6 | |
| ITF M25 Calabasas | 03/20 20:30 | 25 | August Holmgren v Cash Hanzlik | 7-6,7-5 | |
| ITF M25 Bakersfield | 03/16 17:00 | 26 | Emile Hudd v August Holmgren | Cancelled | |
| ITF M25 Bakersfield | 03/15 17:55 | 27 | [489] Ernesto Escobedo v August Holmgren [278] | 6-3,7-5 | |
| ITF M25 Bakersfield | 03/14 20:00 | 26 | Alexander Klintcharov v August Holmgren | 4-6,4-6 | |
| ITF M25 Bakersfield | 03/14 01:00 | 25 | Alexey Nesterov v August Holmgren | 4-6,4-6 | |
| Challenger Tenerife | 02/29 10:00 | 26 | [227] Lukas Neumayer v August Holmgren [292] | 6-3,6-7,6-4 | |
| Challenger Tenerife | 02/27 13:50 | 25 | [292] August Holmgren v Ilya Ivashka [186] | 6-3,7-5 | |
| Challenger Tenerife | 02/26 10:00 | 19 | [246] Mitchell Krueger v August Holmgren [297] | 5-7,2-6 | |
| Challenger Tenerife Qual | 02/25 10:00 | 14 | [400] Carlos Taberner v August Holmgren [297] | 2-6,7-6,4-6 | |
| Challenger Tenerife | 02/20 10:00 | 25 | [297] August Holmgren v Jesper De Jong [141] | 6-2,4-6,3-6 | |
| Challenger Tenerife | 02/19 10:00 | 19 | [360] Mohamed Safwat v August Holmgren [297] | 4-6,6-7 | |
| Challenger Tenerife | 02/18 12:35 | 14 | Kenay Ortiz Gonzalez v August Holmgren | 3-6,4-6 | |
| ATP Delray Beach | 02/10 23:10 | 14 | [137] Radu Albot v August Holmgren [296] | 6-3,6-4 | |
| Davis Cup | 02/04 20:00 | 4 | [493] Ernesto Escobedo v August Holmgren [292] | 4-6,4-6 | |
| Davis Cup | 02/03 19:50 | 2 | Rodrigo Pacheco Mendez v August Holmgren | 7-6,6-7,6-3 | |
| Challenger Tenerife | 01/15 12:20 | 19 | [296] August Holmgren v Guy Den Ouden [351] | 7-5,6-7,6-7 | |
| Challenger Tenerife | 01/14 13:10 | 14 | August Holmgren v Ivan M Curbelo | 6-4,6-2 | |
| Challenger Oeiras | 01/10 10:30 | 26 | [241] Alejandro Moro Canas v August Holmgren [296] | 6-3,7-5 | |
| Challenger Oeiras | 01/08 15:15 | 25 | [296] August Holmgren v Maximilian Neuchrist [295] | Retired | |
| Challenger Yokkaichi | 12/01 05:05 | 27 | [330] August Holmgren v Chak L C Wong [282] | 6-4,5-7,4-6 | |
| Challenger Yokkaichi | 11/29 03:00 | 26 | [181] Zdenek Kolar v August Holmgren [330] | 4-6,2-6 | |
| Challenger Yokkaichi | 11/28 03:20 | 25 | [454] Yusuke Takahashi v August Holmgren [330] | 3-6,3-6 | |
| Challenger Yokkaichi | 11/27 01:00 | 19 | [337] August Holmgren v Kai Wehnelt [151] | 6-2,6-4 | |
| Challenger Yokohama | 11/21 02:45 | 25 | [337] August Holmgren v Giovanni Fonio [299] | 4-6,1-6 | |
| Challenger Yokohama | 11/21 02:35 | 25 | August Holmgren v James McCabe | Cancelled | |
| Challenger Yokohama | 11/20 01:00 | 19 | [335] August Holmgren v Naoki Tajima [447] | 3-6,7-5,6-3 | |
| Challenger Yokohama | 11/19 02:55 | 14 | [335] August Holmgren v James Trotter [389] | 7-6,3-6,6-4 |
August Holmgren (born 22 April 1998) is a Danish professional tennis player.
Holmgren has a career high ATP singles ranking of World No. 292 achieved on 29 January 2024.
Holmgren represents Denmark at the Davis Cup, where he has a W/L record of 3–0.
Holmgren played five years of college tennis for the San Diego Toreros from 2017 to 2022, receiving numerous West Coast Conference (WCC) honors. He was the nation's top-ranked player after winning the Intercollegiate Tennis Association (ITA) National Fall Championships in late 2021, and he finished his college career as the 2022 NCAA Singles Championship runner-up to Ben Shelton.
Holmgren made his ATP debut at the 2021 San Diego Open after receiving a lucky loser spot into the main draw after third seed Félix Auger-Aliassime withdrew. There, he lost to former world No. 3 Grigor Dimitrov in straight sets.