Grace O'Sullivan (born 8 March 1962) is an Irish politician who served as a Member of the European Parliament (MEP) from Ireland for the South constituency from 2019 until 2024.

[1] O'Sullivan is also known for her activism during a 20-year career with Greenpeace having served on the crew of the Rainbow Warrior when it was bombed in New Zealand in 1985 by French Intelligence.

[4] O'Sullivan was born in County Waterford in Ireland, where she grew up in Tramore, close to the back strand and the surrounding countryside, an environment which she says was influential on her life and appreciation of nature and the sea.

[5] She spent some time as a lifeguard with Waterford County Council, patrolling Tramore beach during the summer months.

[9][10] O'Sullivan had been sailing from Florida to Hawaii on the Rainbow Warrior, and went to several small island nations in the Pacific Ocean, taking part in actions for peace and climate justice.

[10] On the night of the bombing, two French agents detonated limpet mines and sank the ship as it sat in Auckland Harbour.

[11] The purpose of the action was to highlight how close Russian and American vessels carrying nuclear weapons were to populations around the Mediterranean.

[13] O'Sullivan ran as the Green MEP candidate for the Ireland South constituency in the 2014 European election,[16] being eliminated on the 7th count with approximately 4% of first preference votes.

[24] In 2021, Grace O'Sullivan drafted and tabled a European Parliament Resolution calling for the establishment of two Marine Protected Areas in the Antarctic Southern Ocean.

[4][28] Throughout 2021 Grace was the Rapporteur (Parliament's lead negotiator) on the 8th Environment Action Programme environmental legislation.