| John Lamb | |
| Birth Name: | John Stewart Lamb[1] |
| Birth Date: | 12 April 1907 |
| Birth Place: | Armidale, New South Wales |
| Death Date: | 12 June 1983 |
| School: | Newington College |
| Spouse: | Elsey |
| Ru Position: | lock |
| Repyears1: | 1928 |
| Repcaps1: | 3 |
| Reppoints1: | 0 |
John Stewart "Mac”Lamb (born 12 April 1907 – 12 June 1983) was a rugby union player who represented Australia.
Lamb, a lock, claimed a total of 3 international rugby caps for Australia.In 1924 and 1925 he attended Newington College.