| Lancelot Smith | |
| Birth Name: | Lancelot Machattie Smith[1] |
| Birth Date: | circa 1885 |
| Birth Place: | Bathurst, New South Wales |
| Death Place: | Orange, New South Wales |
| Ru Position: | centre |
| Repyears1: | 1905 |
| Repteam1: | Australia |
| Repcaps1: | 1 |
| Reppoints1: | 0 |
Lancelot Machattie "Mac" Smith (c. 1885 - March 1956) was a rugby union player who represented Australia.
Smith, a centre, was born in Bathurst, New South Wales and claimed one international rugby cap for Australia, playing against New Zealand, at Dunedin, on 2 September 1905.