Stephen Robert Sizer is a priest in the Church of England. He is banned from serving as a priest until 2030. From 1997 to 2017, he was vicar of Christ Church, Virginia Water, in Surrey.
Sizer is known for his opposition to Christian Zionism, which is the basis of his 2003 PhD thesis and the focus of his published works, and for his controversial views about Jews. In October 2012, the Board of Deputies of British Jews lodged a complaint against Sizer with the Church of England under the Clergy Discipline Measure alleging that he had made antisemitic statements and published links to antisemitic web sites. Although he did not admit culpability, at a conciliation meeting in October 2013 Sizer agreed to have his online web usage monitored.
In 2015, the Board of Deputies lodged a further complaint against Sizer, this time for posting a link accusing Jews and Israel of responsibility for the 9/11 attacks in the United States. He was censured by the Bishop of Guildford, who imposed a complete ban on Sizer's use of all social media for at least six months.