Alexander Thomas Turnbull (December 6, 1863 or 1872 – August 27, 1956) was a Canadian lacrosse player who competed and won gold in the 1908 Summer Olympics.

In the fall of 1897, Turnbull moved to British Columbia—first to Rossland and then onwards to New Westminster where he would launch a 14-season career [spanning from 1897 to 1909, followed by a comeback in 1918] with the Salmonbellies.

Notable for the time, he never drank and varely smoked, and he was praised in newspapers such as the Ottawa Citizen for his temperance and "clean living".

The Montréal Gazette noted in a 1908 article that he was aged 44 at the time of publication (on July 31, 1908), and he would be 45 as of September of that year, implying he was born in 1863.

In an Ottawa Citizen reprint of a Vancouver Daily Province article in 1917, his age at retirement in 1910 was quoted as being 42, which would then imply a birth year of 1868 thereabouts.