| ITF M15 Vejle | 07/29 10:35 | 28 | August Holmgren v Alec Deckers | 4-6,6-7 | |
| ITF M15 Vejle | 07/28 08:00 | 27 | August Holmgren v Luigi Sorrentino | 6-3,6-2 | |
| ITF M15 Vejle | 07/27 13:20 | 26 | August Holmgren v Paul Woerner | 6-3,7-5 | |
| ITF M15 Vejle | 07/26 08:35 | 25 | August Holmgren v Philip Hjorth | 6-2,6-3 | |
| Braunchsweig, Germany | 07/13 13:20 | 27 | [266] Benjamin Hassan v August Holmgren [468] | 3-6,7-6,6-3 | |
| Braunchsweig, Germany | 07/12 12:40 | 26 | [210] Adrian Andreev v August Holmgren [468] | 4-6,6-3,6-7 | |
| Braunchsweig, Germany | 07/11 11:25 | 25 | [468] August Holmgren v Jaume Munar [109] | 2-6,7-5,7-6 | |
| Braunchsweig, Germany | 07/10 09:00 | 19 | [301] Oriol Roca Batalla v August Holmgren [468] | 6-1,6-7,5-7 | |
| Braunchsweig, Germany | 07/09 12:30 | 14 | Matthew Dellavedova v August Holmgren | 4-6,6-7 | |
| Challenger Troyes | 07/03 09:45 | 19 | Maxence Beauge v August Holmgren | 7-6,6-4 | |
| Challenger Troyes | 07/02 14:00 | 14 | Paul Inchauspe v August Holmgren | 4-6,1-6 | |
| ITF M25 Risskov/Aarhus | 06/15 08:30 | 26 | August Holmgren v Lewie Lane | 7-5,3-6,4-6 | |
| ITF M25 Risskov/Aarhus | 06/14 11:50 | 25 | August Holmgren v Philip Hjorth | 6-2,6-4 | |
| Challenger Heilbronn | 06/04 09:30 | 14 | [476] Moraing, Mats v August Holmgren [416] | 6-3,6-2 | |
| ITF M25 Rome | 05/30 09:55 | 25 | August Holmgren v Samuele Pieri | 6-7,3-6 | |
| ITF - M25 Nottingham | 04/30 09:30 | 29 | [474] August Holmgren v Lucas Poullain [464] | 7-6,7-6 | |
| ITF - M25 Nottingham | 04/29 09:00 | 28 | [474] August Holmgren v Daniel Little [432] | 6-1,6-3 | |
| ITF - M25 Nottingham | 04/28 12:30 | 27 | [414] Christian Sigsgaard v August Holmgren [474] | 5-7,4-6 | |
| ITF - M25 Nottingham | 04/27 11:40 | 26 | Matthew Dellavedova v August Holmgren | 1-6,3-6 | |
| ITF - M25 Nottingham | 04/25 10:20 | 25 | Weightman, Oscar v August Holmgren | 2-6,7-5,1-6 | |
| ITF - M25 Nottingham | 04/19 10:20 | 25 | August Holmgren v Hamish Stewart | 6-7,5-7 | |
| ITF - M25 Sharm El Sheikh | 04/12 08:30 | 25 | [472] August Holmgren v Sergey Fomin [369] | 6-4,0-6,2-6 | |
| ITF - M25 Saint-Dizier | 03/28 08:00 | 25 | Tim Handel v August Holmgren | 7-6,6-3 | |
| ITF - M25 Toulouse | 03/21 16:15 | 25 | [426] Arthur Reymond v August Holmgren [482] | 6-3,6-4 | |
| ITF M25 Portimao | 03/17 10:30 | 27 | [489] Goncalo Oliveira v August Holmgren [482] | 6-7,7-6,6-3 | |
| ITF M25 Portimao | 03/16 12:50 | 26 | [482] August Holmgren v Skander Mansouri [275] | 6-3,7-6 | |
| ITF M25 Portimao | 03/14 14:25 | 25 | [482] August Holmgren v Duarte Vale [426] | 6-3,6-3 | |
| ITF - M25 Faro | 02/24 11:50 | 27 | [364] Michael Vrbensky v August Holmgren [486] | 7-6,7-6 | |
| ITF - M25 Faro | 02/23 12:40 | 26 | [486] August Holmgren v Giovanni Fonio [332] | 6-2,3-6,7-5 | |
| ITF - M25 Faro | 02/21 14:35 | 25 | [469] Felix Gill v August Holmgren [486] | 6-7,6-7 |
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.