Howarth was a native of Crompton in Lancashire, England, and was educated at Crompton House School in the locality. He worked on the railways, joining the Transport Salaried Staffs Association, but joined the Royal Air Force on the outbreak of the Second World War; after demobilization he returned to his old job.
In 1950 Howarth joined the Labour Party. He served on the National Executive Committee of his Union from 1954 to 1960, and was elected to Wembley Borough Council from 1953 to 1956 and 1957 to 1960. He was a Justice of the Peace for the Gore Division of Middlesex from 1957.
At the 1964 general election, Howarth was narrowly elected as Labour MP for Wellingborough in Northamptonshire. In Parliament he was interested in transport, local government and Home Office matters. He was re-elected in the 1966 election with his majority increased to 2,233, but died at Rickmansworth, in post in August 1969.
- M. Stenton and S. Lees, "Who's Who of British MPs", Vol. IV (Harvester Press, 1981)
- Hansard 1803–2005: contributions in Parliament by Harry Howarth
|Parliament of the United Kingdom|
|Member of Parliament for Wellingborough
| Succeeded by|