Wesley Jonell-Cleavon Bell (born November 5, 1974) is an American attorney and politician serving as the U.S. representative for Missouri's 1st congressional district since 2025. A member of the Democratic Party, he previously served as prosecuting attorney for St. Louis County, Missouri, from 2019 to 2025.

In a major upset, he defeated long-time yet controversial county prosecutor Bob McCulloch in the August 2018 Democratic primary election, and became the first Black county prosecuting attorney in St. Louis County history when he took office in January 2019. On June 7, 2023, Bell announced his candidacy in the 2024 United States Senate election in Missouri. In October 2023, he instead opted to run for the U.S. House seat of Missouri's 1st congressional district, defeating incumbent Cori Bush in the Democratic primary in August 2024. Bell's campaign received over $8.5m from pro-Israel lobbying groups such as AIPAC and United Democracy Project during the primary election. His opponent was Cori Bush, a member of the "Squad", a group of American politicians who had criticized Israel's actions in the Gaza war. He won the general election in November.

Bell was raised in northern St. Louis County, Missouri. He is the son of a police officer father and civil servant mother. Bell is a graduate of Hazelwood East High School, Lindenwood University, and University of Missouri School of Law.

After graduating from law school, Bell worked as a St. Louis County public defender. He later joined the faculty of Florissant Valley Community College as a professor in the criminology department. Additionally, he also was appointed to be a municipal court judge in Velda City and municipal prosecutor in Riverview. While working as a municipal judge in Velda City, Bell was sued by Arch City Defenders, a local nonprofit, for his role in Velda City's cash bail system.

In 2006, Bell managed the campaign of Mark J. Byrne, a Republican candidate challenging Lacy Clay's seat in Missouri's 1st congressional district. Byrne ran on a conservative platform, including strong opposition to abortion. Byrne described Bell's participation in the campaign as a "friendly favor," saying that Bell did his best to help Byrne win despite their different political views.

In 2015, following the Ferguson Protests, Bell was elected to Ferguson city council, beating out Lee Smith, a first time candidate popular among Ferguson protestors.

In 2018, Bell entered the race for county prosecutor. He ran on a platform of community based policing, assigning special prosecutors in homicides by police, pledging to never seek the death penalty, reforming cash bail/bond, and other progressive points. He received significant support from local and national activists and advocacy groups. The election was also seen as a referendum on incumbent Bob McCulloch, for his decision not to prosecute the white police officer who shot and killed Michael Brown.

In his first hours in office, Bell ordered his assistant prosecutors not to prosecute marijuana cases under 100 grams without evidence of distribution of the drug; however, he still prosecuted marijuana cases where the person possessing the marijuana is armed with a weapon. His office stopped seeking warrants on cases that solely involve the possession of marijuana. Additionally, during his first days in office Bell elected to stop prosecuting criminal child support cases.