Denis Arthur Allchurch (born 1953) is a Canadian provincial politician.
Allchurch was elected to Legislative Assembly of Saskatchewan from 1999 from constituencies of Shellbrook-Spiritwood, unseating Lloyd Johnson of the then-governing New Democratic Party in a close race.
Running in a new district that included locales historically much less friendly to the NDP, Allchurch was re-elected by comfortable margins in 2003 and 2007.
He managed to defeat a challenge for his party nomination prior to the 2007 election.
[2] Allchurch's successor would go on to become Premier of Saskatchewan in 2018, an office he still holds as of 2025.