Mateusz Demczyszak (born 18 January 1986) is a Polish middle-distance runner.
Mateusz Demczyszak (born 18 January 1986) is a Polish middle-distance runner.
| Year | Competition | Venue | Position | Event | Notes |
|---|---|---|---|---|---|
Representing  Poland | |||||
| 2005 | European Junior Championships | Kaunas, Lithuania | 5th | 3000 m s'chase | 8:57.24 |
| 2007 | European U23 Championships | Debrecen, Hungary | 9th | 3000 m s'chase | 8:55.30 |
| 2010 | European Championships | Barcelona, Spain | 8th | 1500 m | 3:44.42 |
| 2011 | European Indoor Championships | Paris, France | 12th (h) | 1500 m | 3:47.67 |
| 2012 | European Championships | Helsinki, Finland | 10th (h) | 1500 m | 3:43.97 |
| 2013 | European Indoor Championships | Gothenburg, Sweden | 13th (h) | 3000 m | 7:59.41 |
| World Championships | Moscow, Russia | 29th (h) | 3000 m s'chase | 8:34.60 | |
| 2014 | IAAF World Relays | Nassau, Bahamas | 6th | 4 × 1500 m | 15:05.70 |
| European Championships | Zürich, Switzerland | 10th | 3000 m s'chase | 8:34.32 | |
| 2015 | European Indoor Championships | Prague, Czech Republic | 22nd (h) | 3000 m | 8:09.30 |
| IAAF World Relays | Nassau, Bahamas | 4th | Distance medley relay | 9:24.07 | |
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