| Kirwan Sanday | |
| Birth Date: | 13 February 1991 |
| Height: | 186cm (73inches) |
| Weight: | 118kg (260lb) |
| School: | St Joseph's College, Nudgee |
| Relatives: | John Sanday (uncle) |
| Ru Currentposition: | Prop |
| Ru Currentteam: | Queensland Country |
| Position: | Prop |
| Years1: | 2014, 2016–pres. |
| Years2: | 2015 |
| Clubs2: | Sydney Stars |
| Points1: | 0 |
| Points2: | 0 |
| Apps1: | 6 |
| Apps2: | 3 |
| Ru Clubupdate: | 9 October 2016 |
| Superyears1: | 2017–pres. |
| Superapps1: | 9 |
| Superpoints1: | 0 |
| Super14update: | 2 June 2017 |
| Repteam2: | Fiji Warriors |
| Repyears1: | 2009–2010 |
| Repyears2: | 2015 |
| Repcaps1: | 5 |
| Repcaps2: | 1 |
| Reppoints1: | 8 |
| Reppoints2: | 0 |
| Ru Ntupdate: | 27 May 2015 |
Kirwan Sanday is an Australian professional rugby union player of Fijian descent. He is associated with the Queensland Reds. Sanday's primary position on the field is prop. Throughout his career he played 118 caps for Queensland Reds.
He is the nephew of John Sanday, the former international rugby player for Fiji. Sanday attended St Joseph's College, Nudgee in Brisbane and was selected for the Queensland team at the Australian Schools Rugby Championships.
Sanday joined the Easts Tigers to play in the Queensland Premier Rugby competition. He played for in 2009 and 2010 at the World Championships. Sanday was selected for the Fiji Warriors against Argentina XV in Uruguay in 2015 and for Queensland Country in the National Rugby Championship.
He made his Super Rugby debut on 27 March 2017 and played off the bench in nine matches of the 2017 season.