Halladay
Halladay is an English and Scottish surname which may refer to:
- Daniel Halladay (1826–1916), American engineer, inventor and businessman
 - Howard Hadden Halladay (1876–1952), Canadian politician
 - Roy Halladay (1977–2017), American baseball player
 
See also
- Halladay (automobile), a defunct American automobile manufacturing company founded in 1905
 - Halladay Farmhouse, Duanesburg, New York, on the National Register of Historic Places
 - Halliday, a list of people with the surname Halliday or Haliday