Mark Dearey (born 19 March 1963) is an Irish Green Party politician who served as a Senator from 2010 to 2011, after being nominated by the Taoiseach.

His sister-in-law, Marianne Butler, remains a Green Party member of Louth County Council.

He ran unsuccessfully as the Green Party candidate in the Midlands–North-West constituency for the 2014 European Parliament election and received 1.5% of the first preference votes.

He first came to public attention in County Louth in 1994, when he and three others from the county took a court action against British Nuclear Fuels, to seek an end to reprocessing at Sellafield as a member of STAD (Stop Thorpe Alliance Dundalk).

He then acquired the music venue and bar, The Spirit Store in Dundalk which he still owns and manages.