| Janez Semrajc | |
| Residence: | Ljubljana, Slovenia |
| Birth Date: | 24 July 1989 |
| Birth Place: | Ljubljana, Slovenia |
| Plays: | Right-handed |
| Careerprizemoney: | $67,543 |
| Singlestitles: | 0 |
| Highestsinglesranking: | No. 262 (16 June 2014) |
| Currentsinglesranking: | No. 348 (17 August 2015) |
| Doublestitles: | 0 |
| Highestdoublesranking: | No. 605 (6 October 2014) |
| Currentdoublesranking: | No. 605 (6 October 2014) |
| Updated: | 17 August 2015 |
Janez Semrajc (born 24 July 1989) is a Slovenian professional tennis player who currently competes on the ITF Men's Circuit. In June 2014, he achieved a career-high singles world ranking no. 262. He has played for the Slovenia Davis Cup team.