John Anthony Olszewski Jr., also known by his nickname Johnny O, is an American politician who is the member-elect of the U.S. House of Representatives from Maryland's 2nd congressional district. He is also the 14th and current county executive of Baltimore County, Maryland.
A member of the Democratic Party, Olszewski previously served as a student member of the Baltimore County Board of Education from 1999 to 2000, and two terms in the Maryland House of Delegates representing the 6th district from 2006 to 2015. The district covered most of the southeastern portion of Baltimore County, including the town of Dundalk, Maryland. Olszewski unsuccessfully ran for the Maryland Senate in District 6 in 2014, narrowly losing to Republican challenger Johnny Ray Salling. Olszewski has served as Baltimore County Executive since 2018; he narrowly defeated state senator James Brochin in the 2018 Democratic primary election and defeated former state Insurance Commissioner Alfred W. Redmer Jr. in the general election. Olszewski was re-elected in 2022, defeating Republican nominee Pat McDonough.
Olszewski defeated radio host Kimberly Klacik in the 2024 U.S. House of Representatives election in Maryland's 2nd congressional district to succeed Dutch Ruppersberger. He will be sworn in on January 3, 2025.
