William Turnbull
William Turnbull may refer to:
- William Turnbull (bishop), Scottish bishop
- William Turnbull (cricketer), Scottish cricketer
- Bill Turnbull, British journalist and presenter
- Bill Turnbull (actor), Canadian actor active 1995–present
- William Turnbull (artist), Scottish artist
- William Turnbull Jr., American architect
- William Turnbull (New Zealand architect), architect based in Wellington, New Zealand
- William Turnbull (sailor), Hong Kong sailor
- William Barclay Turnbull, Scottish antiquary
- William D. Turnbull, American paleontologist