Sir Thomas Deane was an Irish architect.
Thomas Deane may also refer to:
- Sir Thomas Newenham Deane (1828–1899), Irish architect, the son of Sir Thomas Deane
- Sir Thomas Manly Deane (1851–1933), Irish architect, the son of Sir Thomas Newenham Deane
- Thomas Deane (priest) (1645–1713), Anglican priest in Ireland