John Barr (1 January 1867 – 7 December 1930) was a New Zealand politician representing labour interests. A stonemason by trade, he was involved in many organisations, was a community leader in Redcliffs and became Mayor of Sumner. The establishment of Redcliffs School is credited to him. He was a Member of the Legislative Council for 23 years, where he held the role of Chairman of Committees for the years before his death.