Timothy or Tim Miller may refer to:
- Thomas I. Miller, president of Murray State University
- Tim Miller (director), American film director, VFX artist and co-founder of Blur Studio
- Tim Miller (ice hockey) (born 1987), American ice hockey player
- Tim Miller (performance artist) (born 1958), American performance artist and writer
- Tim Miller (poet) (born 1979), American poet and novelist
- Tim Miller (politician) (born 1965), American politician and member of the Minnesota House of Representatives
- Tim Miller (political strategist) (born 1981), American campaign consultant and critic of Donald Trump
- Tim Miller (yoga teacher), director of the Ashtanga Yoga Center in Carlsbad, CA.
- Timothy Miller (born 1944), American professor of Religious Studies at the University of Kansas
- Timothy Miller, founder and project lead of the Open Graphics Project