| Marek Ujlaky | |
| Birth Date: | 26 March 1974 |
| Birth Place: | Zeleneč, Czechoslovakia |
| Height: | 1.81 m |
| Position: | Midfielder |
| Youthclubs1: | Spartak Trnava |
| Years1: | 1992–2000 |
| Caps1: | 240 |
| Goals1: | 55 |
| Years2: | 2000–2001 |
| Clubs2: | Drnovice |
| Caps2: | 15 |
| Goals2: | 1 |
| Years3: | 2001 |
| Clubs3: | → Spartak Trnava (loan) |
| Caps3: | 16 |
| Goals3: | 9 |
| Years4: | 2001 |
| Caps4: | 16 |
| Goals4: | 2 |
| Years5: | 2002–2007 |
| Caps5: | 127 |
| Goals5: | 30 |
| Years6: | 2007 |
| Clubs6: | Senec |
| Caps6: | 13 |
| Goals6: | 3 |
| Years7: | 2008 |
| Caps7: | 23 |
| Goals7: | 2 |
| Years8: | 2009 |
| Clubs8: | UFC Tadten |
| Caps8: | 15 |
| Goals8: | 3 |
| Years9: | 2009–2012 |
| Clubs9: | OŠK Šúrovce |
| Nationalyears1: | 1995–2001 |
| Nationalcaps1: | 40 |
| Nationalgoals1: | 2 |
Marek Ujlaky (born 26 March 1974) is a Slovak former footballer who played as a midfielder and spent most of his career with Spartak Trnava.