Mantas Dilys (born 30 March 1984) is a Lithuanian triple jumper, who also competed as decathlete. His personal record is 16.68 metres, reached at 2009 in Kaunas.
He represented Lithuania in 2009 World Championships in Athletics without reaching the final.
| 2001 | Debrecen, Hungary | 14th | Ocatathlon | 5542 pts | ||
| 2003 | Tampere, Finland | 5th | Triple Jump | 15.57 m | ||
| 2005 | Erfurt, Germany | 12th | Triple Jump | 15.42 m (wind: +1.1 m/s) | ||
| Universiade | Izmir, Turkey | 11th | Triple Jump | 15.63 m | ||
| 2007 | Birmingham, United Kingdom | 18th (q) | Triple Jump | 15.65 m | ||
| Universiade | Bangkok, Thailand | 8th | Triple Jump | 16.06 m | ||
| 2009 | Universiade | Belgrade, Serbia | 14th (q) | Long Jump | 7.42 m | |
| 10th | Triple Jump | 16.42 m | ||||
| Berlin, Germany | 36th (q) | Triple Jump | 16.09 m | |||
| 2010 | European Championships | Barcelona, Spain | 21st (q) | Triple Jump | 16.32 m | |
| 2011 | Universiade | Shenzhen, China | 17th (q) | Triple Jump | 15.88 m | |
| 2012 | European Championships | Helsinki, Finland | – | Triple Jump | NM |