Rex Sinclair Challies (15 September 1924 – 9 August 2003) was a New Zealand cricketer for Central Districts and Wellington between 1947 and 1956, in a total of 17 first class cricket matches. A legbreak spin-bowler, he took 45 wickets at 37.08, and contributed 98 runs in the lower order. Challies was born in Nelson and died there, where he was "something of a character". Educated at Nelson College from 1934 to 1943, he represented Nelson in the Hawke Cup between 1945–46 and 1959–60.