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