The United Ulster Unionist Council (also known as the United Ulster Unionist Coalition) was a body that sought to bring together the Unionists opposed to the Sunningdale Agreement in Northern Ireland.

The coalition superseded the earlier "Loyalist Coalition" between the DUP, Vanguard and Independent Unionists which was set up for the 1973 Assembly election. The UUUC was established in January 1974. It was organised by Harry West and constituted a formal electoral pact between his Ulster Unionist Party, the Democratic Unionist Party and the Vanguard Unionist Progressive Party. West arranged the movement, having gained control of the UUP from Brian Faulkner, to galvanise opposition to power sharing arrangements that were being put in place and to run against Faulkner's Pro-Assembly Unionists who later formed themselves into the Unionist Party of Northern Ireland.

The UUUC first tested its political credentials in the 1974 general election and the party captured 11 out of 12 Northern Irish seats (7 UUP, 3 VUPP, 1 DUP), whilst the Pro-Assembly Unionists failed to win any seats. In the general election of October that same year the UUUC lost West's seat, Fermanagh and South Tyrone, to Frank Maguire, an independent Republican running as an agreed candidate, leaving them with 10 overall. At Westminster the coalition operated under the name of Unionist Parliamentary Coalition with West accepted as leader.

The UUUC remained fairly coherent as it united behind the Ulster Workers Council Strike in mid 1974 and continued for 1975 elections to the Constitutional Convention in which the group won 46 out of the 78 seats.

The UUUC began to fall apart in 1976 when VUPP leader William Craig suggested working in a potential coalition government with the nationalist Social Democratic and Labour Party. When it became clear that Craig's ideas were not in keeping with those of his partners, Vanguard split with his opponents setting up the United Ulster Unionist Party while Craig's supporters stayed with Vanguard which left the UUUC. The UUUC thereafter consisted of the UUP, DUP and UUUP.

The UUUC set up the United Unionist Action Council in 1977 a policy group and an activism co-ordinating committee. The UUAC became involved with the May 1977 strike by the Ulster Workers Council, that sought to repeat the effects of 1974. However the second strike proved much less effective and it also brought out the divisions within the UUUC, which reached an acrimonious peak in the May 1977 local council elections. By the end of the year the formal alliance had come to an end and the 3 parties split to follow their own separate paths.