Gordon B. Mowrer (1936 – July 19, 2016) was an American politician, businessman, and ordained pastor of the Moravian Church, who served as the mayor of Bethlehem, Pennsylvania, from 1974 to 1978, and again as acting mayor in 1987. Mowrer, who was 36-years old when he took office for his first term in 1974, became the youngest mayor in Bethlehem's history at the time. Mowrer's record as the city's youngest mayor held until Mayor Don Cunningham was sworn in 1998 at the age of 31.