| William Lindsay | |
| Constituency Mp: | Belfast South |
| Term Start: | 2 July 1917 |
| Term End: | 14 December 1918 |
| Predecessor: | James Chambers |
| Successor: | Constituency abolished Thomas Moles (1922) |
| Birth Date: | 1866 |
| Death Date: | 1936 |
| Nationality: | British |
| Party: | Irish Unionist Alliance |
William Arthur Lindsay (1866-1936) was a British politician and Irish Unionist. He was the Member of Parliament for Belfast South between 1917 until 1918 when the seat was abolished. He then served as MP for Belfast Cromac between 1918 and 1922, until the seat was abolished. He was the only MP to ever represent that constituency. He was a member of the Irish Unionist Party and from 1921 the Ulster Unionist Party.