Johnny Mythen (/ˈmaɪðən/) (born 1958/1959) is an Irish Sinn Féin politician who has been a Teachta Dála (TD) for the Wexford constituency since the 2020 general election.

[3] He was elected to Wexford County Council in 2014 for the Enniscorthy local electoral area, serving for five years before losing his seat.

He previously contested the 2016 general election in the Wexford constituency, but narrowly missed out on the last seat by a margin of 52 votes.

[4] Mythen also contested the 2019 Wexford by-election, receiving 4,125 votes (10.3%) and being eliminated on the third count.

At the general election in February 2020, Mythen stood again in Wexford.