Martin Charles Horwood (born 12 October 1962) is a British Liberal Democrat politician who represented South West England in the European Parliament from 2019 to 2020.

Horwood was adopted as parliamentary candidate for Cheltenham following the decision by sitting Liberal Democrat MP Nigel Jones to stand down.

[5] He was appointed by his party to the select committee scrutinising the work of the Office of the Deputy Prime Minister – now the Department for Communities and Local Government.

[6] In July 2005, then party leader Charles Kennedy appointed Horwood to the Shadow Home Affairs team, before he was promoted by Menzies Campbell to be Shadow Environment Minister, under Chris Huhne, whom Horwood had backed in the party's leadership election.

The Group meets two or three times a year and one of its main objectives is to press for ratification of ILO Convention 169 on the rights of indigenous and tribal peoples.

[15] In the 2019 European Parliament election, Horwood was selected by the Liberal Democrats to contest the six-member constituency of South West England; he was second on the party's list.