Ronald "Roly" Crichton ONZM is a New Zealand para-swimmer and coach. At the 1984 Summer Paralympics, he won a gold medal in the 50m Freestyle 2, silver medals in the 200m Freestyle 2 and 25m Butterfly 2, and a bronze medal in the 100m Individual Medley 2. At the 1988 Summer Paralympics, he won a silver medal in the 200m Freestyle 2 and a bronze medal in the 50m Freestyle 2. Crichton is the former coach of para-swimmer Sophie Pascoe, and in the 2019 New Year Honours, he was made an Officer of the New Zealand Order of Merit for services to Paralympic sport.