Smalley is a surname. Notable people with the surname include:
- Adam Smalley, British Racing Driver
- Beryl Smalley, historian
- Bill Smalley, British footballer
- Dave Smalley, musician
- Dave Smalley (Cleveland), musician
- David Allen Smalley, democrat
- Denis Smalley, musician
- Eugene Byron Smalley plant pathologist
- Gary Smalley, counselor
- Hal Smalley, politician
- Howard Smalley (born 1942), New Zealand cricketer
- Kyle E. Smalley, astronomer
- Luke Smalley (1955–2009), American photographer
- Phillips Smalley, film director
- Richard Smalley, Nobel prize in chemistry 1996
- Roger Smalley (1943–2015), musician
- Roy Smalley Jr., baseball player
- Roy Smalley III, baseball player
- Sherman E. Smalley (1866-1958), American politician and jurist
- Stephen Smalley (1931-2024), British Anglican priest
- Stuart Smalley, fictional character
- Timothy E. Smalley, philanthropist
- Tom Smalley (1912–1984), England international footballer
- Will Smalley, American baseball player
- William A. Smalley (1923–1997), linguist
- William E. Smalley, American bishop