James Dawson Chichester-Clark, Baron Moyola, PC, DL was the penultimate Prime Minister of Northern Ireland and eighth leader of the Ulster Unionist Party between 1969 and March 1971. He was Member of the Northern Ireland Parliament for South Londonderry for 12 years, beginning at the by-election to replace his grandmother, Dame Dehra Parker in 1960. He stopped being an MP when the Stormont Parliament was suspended and subsequently abolished with the introduction of Direct Rule by the British Government.

The prime minister of Northern Ireland was the head of the Government of Northern Ireland between 1921 and 1972. No such office was provided for in the Government of Ireland Act 1920; however, the Lord Lieutenant of Ireland, as with governors-general in other Westminster systems such as in Canada, chose to appoint someone to head the executive even though no such post existed in statute law. The office-holder assumed the title prime minister to draw parallels with the prime minister of the United Kingdom. On the advice of the new prime minister, the lord lieutenant then created the Department of the Prime Minister. The office of Prime Minister of Northern Ireland was suspended in 1972 and then abolished in 1973, along with the contemporary government, when direct rule of Northern Ireland was transferred to London.