Romanian long-distance runner
Marius Viorel Ionescu (born December 18, 1984) is a Romanian long-distance runner.[1]
At the 2012 Summer Olympics, he competed in the Men's marathon, finishing in 26th place.
| Year | Competition | Venue | Position | Event | Notes |
Representing  Romania |
| 2003 | European Junior Championships | Tampere, Finland | 2nd | 5000 m | 14:16.12 |
| 1st | 10,000 m | 29:40.41 |
| European Cross Country Championships | Edinburgh, United Kingdom | 5th | Junior race (6.595 km) | 21:04 |
| 2nd | Junior race - Team | 31 pts |
| 2005 | European U23 Championships | Erfurt, Germany | 4th | 5000m | 14:15.42 |
| 3rd | 10,000m | 29:34.52 |
| Universiade | Izmir, Turkey | 18th | 10,000 m | 31:08.11 |
| Jeux de la Francophonie | Niamey, Niger | 7th | 5000 m | 14:28.75 |
| 2007 | European Indoor Championships | Birmingham, United Kingdom | 16th (h) | 3000 m | 8:06.02 |
| Universiade | Bangkok, Thailand | 16th | 5000 m | 14:40.19 |
| 2010 | European Championships | Barcelona, Spain | 21st | 10,000 m | 30:21.76 |
| 2011 | World Championships | Daegu, South Korea | 13th | Marathon | 2:15:32 |
| 2012 | Olympic Games | London, United Kingdom | 26th | Marathon | 2:16:28 |
| 2013 | World Championships | Moscow, Russia | 26th | Marathon | 2:18:31 |
| 2014 | European Championships | Zürich, Switzerland | — | Marathon | DNF |
| 2015 | Düsseldorf Marathon | Düsseldorf, Germany | 1st | Marathon | 2:13:19 |
| 2015 | World Championships | Beijing, China | — | Marathon | DNF |
| 2016 | Düsseldorf Marathon | Düsseldorf, Germany | 2nd | Marathon | 2:12:58 |
| European Championships | Amsterdam, Netherlands | 25th | Half marathon | 1:05:21 |
| Olympic Games | Rio de Janeiro | 37th | Marathon | 2:17:27 |
Romania