Robert James McMordie, KC (31 January 1849 – 25 March 1914) was an Irish barrister, politician, and Lord Mayor of Belfast.

He was a Unionist member of the Belfast Corporation from 1907, serving as the city's Lord Mayor during the turbulent years from 1910 until his sudden death in 1914.

In 1912 he helped to establish the Young Citizen Volunteers of Ireland, an entity which, until its merger into the Ulster Volunteers, spanned much of the province of Ulster from isolated loyalist outposts on the Atlantic coast of County Donegal to East Belfast, a Unionist heartland.

each month: he was to attend weekly drills, there to learn modified military and police drill, single stick, rifle and baton exercises, signalling, knot-tying and other such exercises.

If possible he was also to gain some knowledge of life saving and ambulance work..."[1] Lord Mayor McMordie died at Cabin Hill, Knock, Belfast, aged 65.