Ian Simpson may refer to:
- Ian Simpson (architect) (born c. 1956), English architect
- Ian Simpson Architects, an English architecture practice established in 1987 by Ian Simpson and Rachel Haugh
- Ian Simpson (motorcyclist) (born 1970), motorcycle road racer from Scotland
- Ian Simpson (long jumper), British athlete and champion at the 1993 UK Athletics Championships
- Kevin Abstract (Clifford Ian Simpson, born 1996), American rapper
This disambiguation page lists articles about people with the same name.
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