The refereeing appointments for the semi-finals of the 2018-19 William Hill Scottish Cup have been confirmed. 

Heart of Midlothian v Inverness Caledonian Thistle
Referee: Don Robertson
Assistants: Graeme Stewart, Paul O'Neill (replacement for Sean Carr)
Additional Assistants: Andrew Dallas, Greg Aitken
Fourth Official: John Beaton

Aberdeen v Celtic
Referee: Craig Thomson
Assistants: Douglas Ross, David Roome
Additional Assistants: Steven McLean, Euan Anderson
Fourth Official: Nick Walsh