William Dana or Bill Dana may refer to:

• Bill Dana (1924–2017), stage name of William Szathmary, American comedian, actor, and screenwriter
• William H. Dana (1930–2014), NASA test pilot and astronaut
• William Parsons Winchester Dana (1833–1927), American artist
• Mrs. William Starr Dana, name used by Frances Theodora Parsons (1861–1952), American botanist and author

• William Dana Ewart, American inventor
• William Dana Orcutt, American book designer