The 2003 Plaid Cymru leadership election was held following the resignation of Ieuan Wyn Jones after a disappointing showing in the 2003 Assembly elections where the party fell from 17 to 12 seats.
2003 Plaid Cymru leadership election
|8 May 2003 – 15 September 2003
Ieuan Wyn Jones had led the party since 2000.
Ieuan Wyn Jones initially resigned but then decided to contest the leadership election, he was challenged by Helen Mary Jones whom he had defeated three years previously, as well as Rhodri Glyn Thomas.
The contest was narrowly won by Ieuan Wyn Jones in the final round with 2,603 votes, against Helen Mary Jones' 2,532.