Marni Lynn von Wilpert (born 1983) is an American attorney and politician who has served as a member of the San Diego City Council since 2020, representing District 5. She is a member of the Democratic Party.

Von Wilpert is a candidate for California's 40th senatorial district in the 2026 election.

Marni von Wilpert was born and raised in the Scripps Ranch neighborhood of San Diego. After graduating from Scripps Ranch High School in 2001, she earned a Bachelor of Arts degree in peace and conflict studies from the University of California, Berkeley. She then obtained a Juris Doctor from the Fordham University School of Law.

After receiving her degree from the University of California, Berkeley, von Wilpert served as a Peace Corps volunteer in Botswana during the height of the HIV/AIDS epidemic in Africa. After graduating from law school, von Wilpert founded a legal clinic associated with the Mississippi Center for Justice. Additionally, von Wilpert served as a law clerk for Judge James E. Graves Jr. and worked as an attorney for the National Labor Relations Board. She was also a detail staffer on the United States House Committee on Education and Labor and served as an advisor to committee chair Congressman Bobby Scott. In 2017, von Wilpert joined the Economic Policy Institute as Associate Labor Counsel. She served as Deputy City Attorney in the San Diego City Attorney's Office from 2018 to 2020.

In the 2020 San Diego city council election, von Wilpert placed first in the nonpartisan blanket primary and defeated Joe Leventhal in the November general election. She assumed office on December 10, 2020.

In December 2020, she was appointed to serve on the San Diego County Regional Airport Authority board of directors. She ran unopposed for re-election in the 2024 San Diego City Council election, winning the election outright in the primary on March 5, 2024. After her election victory, she filed to run for California's 40th State Senatorial district in the 2026 election.