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| Date: | September |
| Location: | Buenos Aires, Argentina  |
| Type: | Road |
| Distance: | Half marathon |
| Est: | 1989 |
| Organizer: | Asociación Ñandú |
| Record: | Men's: 59:05 (2019) Bedan KarokiWomen's: 1:06:10 (2023)  Ababel Yeshaneh |
| Participants: | 7,413 finishers (2021) |
The Buenos Aires Half Marathon (official name: 21k Buenos Aires), is an annual road running competition over the half marathon distance 21.0975km (13.1094miles) which takes place in Buenos Aires, Argentina in September. The route starts and ends in City Park and winds through the city center.
The 2011 edition of the race hosted the South American Marathon Championships. The race has also hosted the national championships for Argentina, four times for men (1997, 2001, 2015, 2017) and four times for women (1997, 1999, 2001, 2015). The course records are held by Brazilian Marílson Gomes dos Santos (1:01:13) and home athlete Florencia Borelli (1:11:58).
Key:
| Year | class=unsortable | Men's winner | Time (h:m:s) | class=unsortable | Women's winner | Time (h:m:s) |
|---|---|---|---|---|---|---|
| 1989 | 1:04:22 | 1:17:38 | ||||
| 1990 | 1:06:10 | 1:20:23 | ||||
| 1991 | 1:03:49 | 1:17:29 | ||||
| 1992 | 1:04:11 | 1:15:14 | ||||
| 1993 | 1:03:15 | 1:13:39 | ||||
| 1994 | 1:01:05 | 1:12:21 | ||||
| 1995 | 1:02:03 | 1:14:30 | ||||
| 1996 | 1:03:26 | 1:14:35 | ||||
| 1997 | 1:04:03 | 1:16:30 | ||||
| 1998 | 1:05:01 | 1:18:12 | ||||
| 1999 | 1:06:01 | 1:17:39 | ||||
| 2000 | 1:04:57 | 1:17:14 | ||||
| 2001 | 1:04:42 | 1:12:59 | ||||
| 2002 | 1:05:40 | 1:14:51 | ||||
| 2003 | 1:06:46 | 1:17:10 | ||||
| 2004 | 1:05:09 | 1:19:17 | ||||
| 2005 | 1:05:30 | 1:15:45 | ||||
| 2006 | 1:05:57 | 1:19:05 | ||||
| 2007 | 1:06:07 | 1:19:52 | ||||
| 2008 | 1:05:48 | 1:16:08 | ||||
| 2009 | 1:10:35 | 1:17:54 | ||||
| 2010 | 1:04:48 | 1:15:16 | ||||
| 2011 | 1:01:13 | 1:13:16 | ||||
| 2012 | 1:02:30 | 1:13:46 | ||||
| 2013 | 1:02:57 | 1:13:20 | ||||
| 2014 | 1:03:48 | 1:16:51 | ||||
| 2015 | 1:04:12 | 1:15:30 | ||||
| 2016 | 1:04:39 | 1:14:19 | ||||
| 2017[1] | 1:01:28 | 1:11:58 | ||||
| 2018 | 59:48 | 1:09:08 | ||||
| 2019 | 59:05 | 1:07:44 | ||||
| 2021 | 1:04:42 | 1:17:22 | ||||
| 2022 | 1:00:29 | 1:07:59 | ||||
| 2023 | 59:08 | 1:06:10 |