Cornelius G. M. Hartnett (1951 – 17 December 2019) was an Irish Gaelic footballer who played for Cork Championship club Millstreet.
Hartnett eventually became the first-choice left wing-back and made numerous National League and Championship appearances in a career that ended with his last game in 1975 before effectively being dropped from the team.
[citation needed] On 29 November 1968, Hartnett was still just 17-years-old when he lined out at left wing-back for the Millstreet senior team in the Tadhg Crowley Cup final.
[citation needed] Hartnett first played for Cork as a member of the minor team during the 1968 Munster Championship.
On 14 July 1968, Hartnett won a Munster Championship when he again lined out at left wing-back in Cork's 2–13 to 0–02 defeat of Kerry in the final.
On 4 October 1970, Hartnett lined out at left wing-back when Cork qualified to play Fermanagh in the All-Ireland final.
On 12 August 1971, Hartnett claimed a second successive Munster Championship medal after Cork's 1–10 to 2–05 defeat of Waterford in the final.
On 18 July 1971, Hartnett was selected amongst the substitutes when Cork qualified to play Kerry in the Munster final.
On 15 July 1973, Hartnett made his first championship start when he was selected at left wing-back when Cork faced Kerry in the Munster final.
[4][5] On 14 July 1974, Hartnett participated in his fifth successive Munster final when he was selected in his customary position of left wing-back against Kerry.