John Wesley Seiffert (9 September 1905 – 10 January 1965) was an Australian politician and a member of the New South Wales Legislative Assembly from 1941 until his death in 1965.
As a youth, he was a keen sportsman, and was an Australian amateur cycle champion as well as a founder of the New South Wales Country Rugby League.
Very shortly before the vote, Sir Asher Joel, a wealthy Sydney businessman, was a surprise nomination against Labor's candidate, Norman Thom.
The four were Seiffert, James Geraghty of (North Sydney), Roy Heferen of (Barwon), and Fred Stanley of (Lakemba).
His readmission to the caucus after the election gave the government of incumbent Premier James McGirr a one-seat majority in the Assembly.