Senator O'Reilly may refer to:

Joe O'Reilly (born 1955), Senate of Ireland Patrick O'Reilly (Longford politician) (1911–2003), Senate of Ireland Pauline O'Reilly (fl. 2010s–2020s), Senate of Ireland Patrick O'Reilly (Cavan politician) (1927–1994), Senate of Ireland

See also Senator Reilly (disambiguation)