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; middle name preference, born 1996), American rapper