Archibald Montgomerie, 18th Earl of Eglinton
| 18th Earl of Eglinton 6th Earl of Winton | |
| Arms of the Earls of Eglinton and Winton | |
| Tenure | 1966-2018 |
| Predecessor | 17th Earl of Eglinton and 5th Earl of Winton |
| Successor | Hugh Montgomerie |
| Other titles | Lord Montgomerie (1945-1966) |
| Born | Archibald George Montgomerie 27 August 1939 |
| Died | 14 June 2018 (aged 78) |
| Nationality | British |
| Residence | Balhomie, near Cargill, Perthshire, Scotland |
| Offices | Chief of Clan Montgomery |
| Spouse(s) |
Marion née Dunn-Yarker
(m. 1964) |
| Issue |
|
| Parents | Archibald Montgomerie, 17th Earl of Eglinton Ursula Watson |
| Occupation | Business executive (retired) |
Archibald George Montgomerie, 18th Earl of Eglinton and 6th Earl of Winton (27 August 1939 – 14 June 2018), styled Lord Montgomerie until 1966, was the son of Archibald William Alexander Montgomerie, 17th Earl of Eglinton, and Ursula Joan Watson.