The 2018 New York State Senate elections were held on November 6, 2018, to elect representatives from all 63 State Senate districts in the U.S. state of New York. Primary elections were held on September 13, 2018.

Andrea Alice Stewart-Cousins is an American politician and educator from Yonkers, New York. A member of the Democratic Party, Stewart-Cousins has represented District 35 in the New York State Senate since 2007 and has served as Majority Leader and Temporary President of that body since 2019. She has previously served twice as acting lieutenant governor of New York under Governor Kathy Hochul, for 16 days in 2021 and between April and May 2022. Stewart-Cousins is the first Black woman to serve as the New York lieutenant governor, although in an acting capacity. She is the first woman in the history of New York State to lead a conference in the New York State Legislature and is also the first female Senate Majority Leader in New York history.