Family
- sister Joy McAvoy: Lead singer with the Scottish girl group Streetside; raised by mother after parents divorce
- grandmother Mary Johnstone: Raised by grandparents after his parents split up
- grandfather James Johnstone: Raised by grandparents after his parents split up
- mother Elizabeth McAvoy:
- father James McAvoy:
Companions
- wife Anne-Marie Duff: Met while co-starring in "Shameless" (BBC); married November 2006
- Companion Emma Neilson: Scottish; began dating when they were 16 years old; no longer together
