Ninian Jamieson Finlay (31 January 1858 – 7 March 1936^[1]) was an international rugby player for Scotland.^[2] He played nine caps for Scotland between 1875 – 1881.^[2] He is generally considered to be the youngest player ever to play for Scotland. He was seventeen years and thirty six days old when he played his first cap against England on 8 March 1875.^[3] He eagerly competes for this record against Charles Reid, who was the same age when he played his first cap. Reid, however, was a day older because of an extra leap year day when he capped in 1881.^[3]

In later life he was a Writer to the Signet.^[1]

Ninian was the brother of James Finlay, who played four caps for Scotland (1871–75), Arthur Finlay, who received a single cap (1875)^[2] and Robert Finlay, 1st Viscount Finlay.

All three brothers played in the 1875 0-0 draw against England at Raeburn Place, with James drawing his last cap and Arthur and Ninian drawing their first.^[4]