Roy Williams (born 9 September 1934) is a retired track and field athlete from New Zealand, who won gold in the decathlon at the 1966 Empire and Commonwealth Games in Kingston, but was overlooked for the 1956, 1960 and 1964 Olympic Games (in 1964 he was in training in California, and was not seen by the selectors).
He also competed in the 1958 Empire and Commonwealth Games at Cardiff in the Long jump and Triple jump, and in the 1970 British Commonwealth Games at Edinburgh in the Decathlon.
He won the national decathlon title 11 times between 1956 and 1970.
He is a (younger) brother of Yvette Williams.
He was inducted into the New Zealand Sports Hall of Fame in 1990.