Thaddeus Joseph Dulski (born September 27, 1915) was a Democratic member of the United States House of Representatives from New York. He represented New York’s 37th congressional district as a Representative, serving eight terms in Congress. His tenure in the U.S. House began on January 7, 1959, and concluded on January 3, 1975.

During his time in office, Dulski served as a historical member of Congress for New York, participating in the legislative work of the House over a period that spanned the late 1950s through the mid-1970s. A member of the Democratic Party, he held federal office continuously throughout these years, representing his district in national affairs. Dulski left Congress as a former member after his service ended in 1975.