Harte's twin brother, Conor, and his sister, Emer, are also Ireland field hockey internationals.

The Harte brothers have lined out together with eight different field hockey teams – Bandon Grammar School, Cork Harlequins, Pembroke Wanderers, DCU, SCHC, Dabang Mumbai, Munster and Ireland.

[4][5][6][7][8][9][10] Harte was educated at Bandon Grammar School and at Dublin City University where he gained a Bachelor of Science in PE and biology and qualified to become a teacher.

In 2005 David and Conor Harte helped Bandon win the All Ireland Schoolboys Hockey Championship.

[2][5][6][12] While studying for their Leaving Cert at Bandon Grammar School, David and Conor Harte, also played for Cork Harlequins, helping them win the 2006 Irish Senior Cup.

[12] In 2008–09, together with his brother Conor, Ronan Gormley, Stuart Loughrey, Justin Sheriff, Craig Fulton and Alan Sothern, Harte was a member of the Pembroke Wanderers team that won the Irish Senior Cup,[17][18] the Men's Irish Hockey League[19] and the EuroHockey Club Trophy.

[24] Harte had just accepted a job offer as a PE teacher at Sutton Park School when SCHC invited him to play for them.

Dabang Mumbai retained him after paying $65,000 in the players' auction, making him the most expensive goalkeeper in the league.

[51][52] In June 2017 Harte was a member of the Ireland team that won the Hamburg Masters, defeating Germany 4–2 in the final.