Patrick O'Neill was an Irish nationalist politician and hotel proprietor. At the Northern Ireland general election, 1921, O'Neill was elected for the Down

Down (Northern Ireland Parliament constituency)

Down was a county constituency of the Parliament of Northern Ireland from 1921 - 1929. It returned eight MPs, using the single transferable vote method of proportional representation.-Boundaries:...

 constituency. He took his seat on 9 March 1926. He was re-elected at Northern Ireland general election, 1925

Northern Ireland general election, 1925

The Northern Ireland general election, 1925 was held on 3 April 1925. It was the second election to the Parliament of Northern Ireland. It saw significant losses for the Ulster Unionist Party, although they maintained their large majority. This was the last election for the Stormont parliament...

 for Down. At the Northern Ireland general election, 1929

Northern Ireland general election, 1929

-References:*...

, he was elected for the Mourne

Mourne (Northern Ireland Parliament constituency)

Mourne was a constituency of the Parliament of Northern Ireland.-Boundaries:Mourne was a county constituency comprising part of southern County Down, including the Mountains of Mourne. It was created when the House of Commons Act 1929 introduced first-past-the-post elections throughout Northern...

 constituency and was re-elected in 1933. He was spokesman of the Irish Nationalist Party

Nationalist Party (Northern Ireland)

The Nationalist Party† - was the continuation of the Irish Parliamentary Party, and was formed after partition, by the Northern Ireland-based members of the IPP....

on financial matters.