Robert Griffiths may refer to:
- Robert Griffiths (politician), British communist politician
- Robert Griffiths (physicist) (born 1937), American physicist
- Robert Griffiths (mathematician), Australian statistician
- Robert William Griffiths (1896–1962), Welsh farmer and businessman
- Bob Griffiths (footballer), footballer for Chester City
- Bob Griffiths (writer) (born 1938), American author, playwright and professional speaker
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