British swimming champions – 100 metres freestyle winners

The British swimming champions over 100 metres freestyle, formerly the (Amateur Swimming Association (ASA) National Championships) are listed below.

The event was originally contested over 110 yards and then switched to the metric conversion of 100 metres in 1971. In 1963 Bob McGregor of Scotland set a world record in the heats (54.4 sec) and the final (54.1 sec). In 1975 and 1984 there was a dead-heat in the women's final.