Sydney Walter Austin (16 November 1866 – 9 September 1932) was an Australian cricketer.
He played eight first-class matches for New South Wales between April 1893 and February 1894.All but one match of his first-class career came on New South Wales's tour of New Zealand in 1893–94, when he took 52 wickets in seven matches with his leg-spin, including 8 for 14 against Hawke's Bay.
In the 160-run victory over New Zealand he opened the bowling and bowled unchanged throughout, taking 7 for 63 and 6 for 35, as well as top-scoring in New South Wales's first innings with 43.He worked in the New South Wales Auditor-General's Department for 43 years.
He died in 1932 and was survived by his wife and a son.