Robert Weir may refer to:
- Robert Weir (politician) (1882–1939), Canadian politician
- Robert Walter Weir (1803–1889), American artist
- Robert Weir (athlete) (born 1961), English discus thrower
- Robert Stanley Weir (1856–1926), Canadian judge and poet
- Bob Weir (born 1947), American singer, songwriter, and guitarist with the Grateful Dead
- Robbie Weir (born 1988), Northern Irish footballer
- Rob Weir, Canadian politician
See also
- Robert E. Wier (born 1967), American judge
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