Arwon (foaled 8 September 1973, died 25 May 2007) was a New Zealand-bred Thoroughbred racehorse by Aritzo from Fair Flash who won the 1978 Melbourne Cup at 5 years of age.In New Zealand, he was known and raced as Flash Guy. Arwon won the 1978 Melbourne Cup, beating Dandeleith and Karu by a half neck.