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Jan Tadeusz Masiel (born 28 March 1963 in Siemiatycze) is a Polish politician. In the years 2004-2009 he was a Member of the European Parliament (MEP) for the Greater Poland Voivodship with the Self-Defense, a Non-Inscrit in the European Parliament.
Masiel was in a Committee on Employment and Social Affairs, and was a substitute for the Committee on Petitions and the Committee on the Environment, Public Health and Food Safety. Masiel was also a member of the Delegation to the EU-Romania Joint Parliamentary Committee.