Robert John Porter, Jr. (1867 – April 24, 1922) was a politician in British Columbia, Canada. He served as mayor of Victoria from 1919 to 1921. The son of Robert John and Alice Porter, he was born at the family cattle farm in Saanich and later entered the family butcher business. Porter married Flora Beaton in 1898. He served on the board of directors for the Royal Jubilee Hospital. He died of pneumonia at the age of 55 just four months after the election. Robert J. Porter Park was named in his honour.