Alexander McNab (27 December 1911 – 12 September 1962) was a Scottish footballer. Although not seen as one of the most important members of the squad in his time at Sunderland, he had a role in two of their greatest successes: he was on the pitch for the league championship clincher in 1936, and replaced injured captain Alex Hastings in the 1937 FA Cup Final. He also won the 1936 FA Charity Shield.