|Representing Great Britain|
|1960 Rome||200 m breaststroke|
|1962 Leipzig||200 m breaststroke|
|1958 Budapest||200 m breaststroke|
|1962 Leipzig||400 m individual medley|
|1958 Budapest||4×100 m medley|
|1962 Leipzig||4×100 m medley|
|British Empire and Commonwealth Games|
|1958 Cardiff||220 yd breaststroke|
|1958 Cardiff||4×110 yd medley|
|1962 Perth||110 yd breaststroke|
|1962 Perth||220 yd breaststroke|
|1962 Perth||440 yd individual medley|
|1962 Perth||4×110 yd medley|
At the 1960 Summer Olympics in Rome, on 27 August 1960, at the age of 19, she won gold in the 200 m breaststroke in 2:49.5 ahead of West Germany's Wiltrud Urselmann (2:50.0), setting a new world record time. She was one of only two GB gold medallists that year, the other being Don Thompson in the 50 kilometre walk.
At the 1962 British Empire and Commonwealth Games in Perth she won three golds: 110 yards breaststroke; 220 yards breaststroke; and 440 yards individual medley. At the 1964 Summer Olympics in Tokyo she came seventh in the 400 m individual medley.
She won the 1963 ASA National Championship 220 yards freestyle title, and was a five times winner of the National Championship 220 yards breaststroke title, which included a world record in the 1962 final. She also won the 440 yards medley title twice in 1963 and 1964.
Lonsbrough was educated at St. Joseph's Catholic College, Bradford, a girls' direct grant grammar school. She became a Treasurer's Office clerk employed at the Huddersfield Town Hall. She won her first gold medal for swimming in the 1958 British Empire and Commonwealth Games in Cardiff. Five world records and seven gold medals followed until her retirement in 1964. At one time she held the Olympic, Empire and European titles at the same time.
She is married to cycling commentator and former leading British professional track cyclist Hugh Porter; they met travelling to Tokyo for the 1964 Summer Olympics and married on Thursday 17 June 1965 at St Peter's Church, Huddersfield. The couple live in Wolverhampton, and, after a spell teaching swimming including the P.E. Dept at Ounsdale High School, she is currently a sports commentator and journalist for The Daily Telegraph, under the name Anita Lonsbrough-Porter.
Anita Lonsbrough was the first female flag bearer for Great Britain at the Summer Games when she carried the flag in the opening ceremony of the 1964 Summer Olympics. She was the first woman winner of BBC Sports Personality of the Year in 1962.
She was awarded an MBE in 1963 for services to swimming.
In 1983 she was inducted into the International Swimming Hall of Fame.
- "50 years ago today, Huddersfield swimmer Anita Lonsbrough received her Olympic gold medal". Huddersfield Examiner. 27 August 2010. Retrieved 25 July 2014.
- Burnton, Simon (12 June 2012). "50 stunning Olympic moments No38: Don Thompson takes walking gold". The Guardian. Retrieved 25 July 2014.
- "Adlington snatches swimming gold". BBC Sport. 11 August 2008. Retrieved 25 July 2014.
- ""Swimming Victory For Black." Times, 23 Aug. 1958, p. 3". Times Digital Archive.
- ""Swimmers Protest At Blackpool." Times, 5 Sept. 1959, p. 3". Times Digital Archive.
- "FROM OUR SWIMMING CORRESPONDENT. "Medal Winners In Action." Times, 24 Sept. 1960, p. 3". Times Digital Archive.
- ""World Records At Blackpool." Times, 15 Sept. 1962, p. 3". Times Digital Archive.
- "FROM OUR SWIMMING CORRESPONDENT. "Miss Lonsbrough Recovers." Times, 29 Aug. 1963, p. 4". Times Digital Archive.
- "From Our Swimming Correspondent. "Meagre Swimming Team For Tokyo." Times, 24 Aug. 1964, p. 3". Times Digital Archive.
- "Flats named". The Catholic Herald. 30 June 1961. Retrieved 25 July 2014.
- "Fifty years for Wolverhampton's golden couple". www.expressandstar.com.
- Jones, Andy (6 March 2008). "STAFFORDSHIRE AND SHROPSHIRE WITH HUGH PORTER". Cycling Weekly. Retrieved 17 August 2008.
- Ringland, Nigel (12 August 2008). "No chance to relax in the Water Cube. The Beijing Olympics". Irish News. Belfast. Retrieved 17 August 2008.
| BBC Sports Personality of the Year