The club was formed and affiliated with the Cork Athletic Union League (Cork AUL) in 1983. In it’s first season, 1983/84 the club won both the AUL Div 3 league and the Saxone Cup. Carrigtwohill United also finished runner-up in the County Cup that year. The next year brought a second place finish in the AUL Div 2 league. Sometime later the club was disbanded for a few years until it reformed in the early 90’s and went on to finish second in AUL Div 3B in 1993. It fell away again until the present incarnation was setup.
Reformed in early 2001 the club had instant success. In the first year Carrigtwohill United won AUL Div 3B, under the management of John McCann.
The next year promotion to Div 1 was achieved with a second place finish in the league. The club then began setting up its schoolboy section with under-10’s and under-11 teams.Also in 2005-06 Carrigtwohill United entered a 2nd adult side into AUL Div 3B.