Mary Davis - best known for her work with the Special Olympics - will declare an interest in running for the Presidency at a press conference in Dublin.
Ms Davis is best known for her role in the highly successful 2003 Special Olympics summer games.
She is currently managing director of Special Olympics Europe and Eurasia, which is responsible for the games in 58 countries.
The 56-year-old is a member of the Council of State that advises President Mary McAleese in the exercise of some powers.
Ms Davis, who is a native of Co Mayo, also chairs the task force on active citizenship.
She will confirm her intention to be a candidate this morning and will seek the support of local authorities, joining Senator David Norris and entrepreneur Seán Gallagher as independent hopefuls.