David Joseph Tomassoni (/tɒməˈsoʊni/ tom-ə-SOH-nee; December 5, 1952 – August 11, 2022) was an American politician who served in the Minnesota Legislature from 1993 to 2022.

He then chaired the Environment, Economic Development and Agriculture Finance Division, co-chaired the Legislative-Citizen Commission on Minnesota Resources (LCCMR), and chaired the Iron Range Resources & Rehabilitation Board (IRRRB) four times.

Tomassoni played professional hockey in Italy for 16 years and for the Italian national team at the 1984 Winter Olympics.

Three weeks after the 2020 elections, when it was determined that the DFL had not won a Senate majority, Tomassoni and Senator Thomas Bakk announced they had left the DFL to form their own "Independent Caucus."

Republican Majority Leader Paul Gazelka welcomed the move and made Tomassoni chair of the Higher Education Finance and Policy Committee in exchange for voting with Republicans on floor votes.