William Comyn
William Comyn may refer to:
- William Cumin, or Comyn, medieval bishop of Durham elect, and Lord Chancellor of Scotland
- William Comyn, Lord of Badenoch
- William Comyns Beaumont, British journalist, author and lecturer
- William Leslie Comyn, Californian businessman and shipbuilder
- William Comyn, Lord of Kilbride, sheriff of Ayr in 1263