| Date: | 12–18 June |
| Edition: | 45th |
| Category: | ATP Tour 250 |
| Draw: | 28S / 16D |
| Prize Money: | €718,410 |
| Surface: | Grass |
| Location: | Stuttgart, Germany |
| Venue: | Tennis Club Weissenhof |
| Champs: |  Frances Tiafoe |
| Champd: | Nikola Mektić / Mate Pavić |
| Main Name: | Stuttgart Open |
The 2023 BOSS Open was a men's tennis tournament played on outdoor grass courts. It was the 45th edition of the Stuttgart Open, and part of the ATP Tour 250 series of the 2023 ATP Tour. It was held at the Tennis Club Weissenhof in Stuttgart, Germany, from 12 June until 18 June 2023.[1]
See main article: 2023 BOSS Open – Singles.
Frances Tiafoe def. Jan-Lennard Struff, 4–6, 7–6(7–1), 7–6(10–8)See main article: 2023 BOSS Open – Doubles.
| Event | W | F | SF | QF | Round of 16 | Round of 32 | Q | Q2 | Q1 |
| Singles | 250 | 150 | 90 | 45 | 20 | 0 | 12 | 6 | 0 |
|---|---|---|---|---|---|---|---|---|---|
| Doubles | 0 |
| Country | Player | Rank | Seed | |
|---|---|---|---|---|
| Stefanos Tsitsipas | 5 | 1 | ||
| United States | Taylor Fritz | 8 | 2 | |
| United States | Frances Tiafoe | 12 | 3 | |
 Poland | Hubert Hurkacz | 14 | 4 | |
| United States | Tommy Paul | 17 | 5 | |
 Italy | Lorenzo Musetti | 18 | 6 | |
| Italy | Matteo Berrettini | 20 | 7 | |
 Australia | Nick Kyrgios | 26 | 8 |
The following players received wildcards into the main draw:[3]
The following players received entry from the qualifying draw:
Alejandro Davidovich Fokina → replaced by 
Corentin Moutet
Jack Draper → replaced by Christopher O'Connell
Zhang Zhizhen| Country | Player | Country | Player | Rank | Seed | |
|---|---|---|---|---|---|---|
 India | Rohan Bopanna | Australia | Matthew Ebden | 27 | 1 | |
| Nikola Mektić | Mate Pavić | 28 | 2 | |||
 Mexico | Santiago González | France | Édouard Roger-Vasselin | 36 | 3 | |
| Kevin Krawietz | Tim Pütz | 50 | 4 |
The following pairs received wildcards into the doubles main draw:
Nicolás Barrientos / Nicolás Jarry → replaced by Romain Arneodo / Grégoire Barrère Julian Cash / Henry Patten → replaced by Aslan Karatsev / 
Jiří Lehečka Austin Krajicek → replaced by William Blumberg / Frances Tiafoe Rajeev Ram / Joe Salisbury → replaced by Albano Olivetti / David Vega Hernández
