Rossa A. Fanning (born 1976) is an Irish barrister and legal academic who has served as the attorney general of Ireland since December 2022.

[16][10][17][18] He acted for Rory McIlroy in a High Court dispute over agreements with his former management company and MCD Productions's barrister when it sought to enforce a judgment against Prince.

[28] He was a member of the legal team for Seán Quinn and two of his sons in action taken by Anglo Irish Bank but resigned while the case was ongoing.

[32] Fanning has acted for the State in judicial review proceedings and for the Health Products Regulatory Authority in a test case in relation to the Pandemrix vaccine.

[39] Fanning was appointed Attorney General of Ireland on 17 December 2022 on the nomination of Leo Varadkar, succeeding Paul Gallagher.