| G. Mahathevan | |
| Fullname: | Mahathevan a/l Gengatharan |
| Birth Date: | 1988 5, df=yes[1] |
| Birth Place: | Setapak, Kuala Lumpur, Malaysia |
| Position: | Defender |
| Youthyears1: | 2006–2008 |
| Youthclubs1: | Selangor FA Reserves and Academy |
| Years1: | 2009 |
| Clubs1: | Shahzan Muda |
| Caps1: | 18 |
| Goals1: | 1 |
| Years2: | 2010 |
| Clubs2: | PKNS |
| Caps2: | 16 |
| Goals2: | 0 |
| Years3: | 2011–2012 |
| Clubs3: | Negeri Sembilan |
| Caps3: | 20 |
| Goals3: | 3 |
| Years4: | 2012–2013 |
| Clubs4: | T-Team |
| Caps4: | 5 |
| Goals4: | 0 |
| Years5: | 2014 |
| Clubs5: | Penang |
| Caps5: | 18 |
| Goals5: | 3 |
| Years6: | 2015 |
| Clubs6: | Sarawak |
| Caps6: | 3 |
| Goals6: | 0 |
| Years7: | 2016 |
| Clubs7: | Megah Murni |
| Caps7: | 0 |
| Goals7: | 0 |
| Years8: | 2017 |
| Clubs8: | Penang |
| Caps8: | 3 |
| Goals8: | 0 |
| Years9: | 2018 |
| Clubs9: | MISC-MIFA |
| Caps9: | 2 |
| Goals9: | 0 |
| Nationalyears1: | 2009–2012 |
| Nationalteam1: | Malaysia |
| Nationalcaps1: | 2 |
| Nationalgoals1: | 0 |
| Club-Update: | June 26, 2018 |
| Nationalteam-Update: | January 25, 2017 |
G. Mahathevan (born 31 May 1988) is a Malaysian former footballer.
In February 2011, Mahathevan was called up to the Malaysia national team for the first time by coach K. Rajagopal for the friendly match against Hong Kong national team where he made his debut as a substitute player.