Quintin O'Connor (31 October 1908 – 3 November 1958) was a union leader, activist, and politician in colonial Trinidad and Tobago from the 1930s to the late 1950s.

Along with his brothers, Quintin was among a small number of young men in Trinidad whose families could afford to provide them with a secondary education.

[2] In 1939, O'Connor and other leaders of the USAC, organized the mainly female workers at the Renown shirt factory and won for them a 12.5 per cent wage increase, and an eight-hour workday among other concessions.

Though originally intent on exclusively organizing clerks, O'Connor and Gomes met with little success and decided to turn the FWTU into an omnibus union.

In addition, the agreement was a sign from the government to other employers that collective bargaining was to become a normal part of labour relations in Trinidad.

However, the TTTUC split up shortly after over the issue of international affiliation with the World Federation of Trade Unions (WFTU).

[6] During the 1930s and '40s, O'Connor associated with a small group of left-leaning Trinidadian writers and thinkers, including Alfred Mendes, Albert Gomes, C. L. R. James, and Ralph de Boissière, among others.

In the late 1940s, O'Connor broke with Gomes, who as a member of the Trinidad's Executive Council abandoned his pro-union sympathies and left-wing politics.

As a member of the Caribbean National Labour Party (CNLP), he contested a seat in Port of Spain North East, but lost with just under 9 per cent of the vote.

However, at a CLC conference, he later withdrew his signature and supported a resolution in favour of Patrick Solomon's minority report that demanded immediate self-government.