| Mike Rayer | |
| Birth Name: | Mike Rayer |
| Birth Date: | 21 July 1965 |
| Birth Place: | Wales |
| Weight: | 115kg (254lb) |
| Ru Position: | Fullback |
| Clubs1: | Cardiff RFC |
| Apps1: | 367 |
| Points1: | 1422 |
| Clubs2: | Bedford Blues |
| Repyears1: | 1991–1994 |
| Repteam1: | Wales |
| Repcaps1: | 21 |
| Reppoints1: | 23 |
| Coachyears1: | 2005 -[1] |
| Coachteams1: | Bedford Blues |
Michael Anthony Rayer (born 21 July 1965)[2] is a former Wales international rugby union player. A full-back, he played his club rugby for Cardiff RFC and Bedford. He is currently coach to Bedford Blues. A talented and popular player, he played during a period where there was little success in Welsh rugby. He is commonly remembered for scoring two tries as a replacement wing against Scotland in 1994 (replacing fellow Cardiff player Nigel Walker). As tactical substitutions were not allowed at that time scores from replacements were still relatively rare.