Ronald McDonald is the primary mascot to the McDonald's restaurant franchise.
Ronald McDonald may also refer to:
- Mac (It's Always Sunny in Philadelphia) (Ronald McDonald), a character from the television series It's Always Sunny in Philadelphia
- Ron McDonald (1933–2000), Australian rules footballer
- Ronald Macdonald, characters in a satirical 2014 advertising campaign for Taco Bell
- Ronald Carroll McDonald (1926–2011), child rapist
- Ronald McDonald (runner) (1874-1947), marathon runner (also spelled Ronald MacDonald)