Thaddeus Joseph Dulski (September 27, 1915 – October 11, 1988) was an American politician from Buffalo, New York who served in the United States House of Representatives as a Democrat from 1959 to 1974.

[1] He worked as a tax consultant and accountant, and served in the United States Navy during World War II.

[1] During his House tenure, he served as a member of the Post Office and Civil Service Committee, of which he was chairman from 1967 until his resignation from Congress.

He retired in 1983 and died of leukemia at the Roswell Park Comprehensive Cancer Center in Buffalo on October 11, 1988, aged 73.

[2] His funeral took place at Queen of Peace Catholic Church in Buffalo, and he was buried at Mount Calvary Cemetery in Cheektowaga, New York.