Swimming at the 1968 Summer Olympics – Women's 100 metre backstroke  The women's 100 metre backstroke event at the 1968 Olympic Games took place between 22 and 23 October. This swimming event used backstroke. Because an Olympic-size swimming pool is 50 metres long, this race consisted of two lengths of the pool. Heat 1 Heat 2 Heat 3 Heat 4 Heat 5 Heat 6  Key: WR = World record