William Joseph Mullan (30 March 1928 – 13 November 2018) was a Scottish football referee.

In 1972, Mullan was selected as a referee for UEFA Euro 1972, where he officiated a semi-final match between Belgium and West Germany.

[1] Later that year, Mullan was selected as a referee for the Summer Olympics in West Germany, where he officiated two matches, both in Munchen: Hungary - Brazil 2-2 (29 August) and F.R.

Mullan died on 13 November 2018 in Edinburgh, Scotland at the age of 90.

This biographical article related to Scottish football is a stub.