British swimming champions – 100 metres breaststroke winners

The British swimming champions over 100 metres breaststroke, 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.

Adrian Moorhouse equalled the world record of 1.01.49 sec in the 1990 men's final.