A group of women employed by Dowdall and O'Mahony, a dairy shop on St Patrick's Street, decided to enter a tournament at Church Road in Blackrock.

[3] In 2009–10 with a team that included Yvonne O'Byrne, Cliodhna Sargent, Rachael Kohler and Sinead McCarthy, Harlequins finished as league runners up.

[8][9][10] In 2016–17 with a team that included Yvonne O'Byrne, Roisin Upton and Naomi Carroll, Cork Harlequins were Irish Senior Cup finalists.

[11][12][13] In 2017–18 O'Byrne, Upton and Carroll helped Harlequins finish as runners up in both the national league [4] and the EY Champions Trophy.

[14][15] In 2019 the team including Caoimhe Perdue won the Irish Senior Cup for the 2nd time against Loreto in the final, winning on shuttles.

More land was purchased and car parking and the pavilion were extended to include two new dressing rooms, a function hall and a kitchen.

[2] Source:[42] When Ireland won the silver medal at the 2018 Women's Hockey World Cup, the squad included two Cork Harlequins players, Yvonne O'Byrne and Roisin Upton.