Williamstown Racecourse was a horse racing track located at Altona, Victoria, Australia. Located south of Kororoit Creek, the racecourse was opened in 1869, following the establishment of the Williamstown Racing Club the previous year. In 1885, the Williamstown Racecourse railway station was opened as the terminus of a branch line from the main Geelong line, providing passenger services on race days. In 1931, Phar Lap won the Underwood Stakes at the venue.