| Teamname: | RK Sisak |
| Fullname: | Ragbi klub Sisak |
| Shortname: | RK Sisak |
| Founded: | 15 February 1970 (as RK Student) |
| Ground: | Stadion Metalac |
| President: | Dubravko Pešut |
| Coach: | Mirsad Žerić |
| Leftarm1: | 003 |
| Body1: | 003 |
| Rightarm1: | 003 |
| Shorts1: | 000 |
| Socks1: | 6CF |
RK Sisak is a Croatian rugby club in Sisak.
The club was founded on 15 February 1970 as RK Student by a couple of university students.