Alan Stuart Lowenthal (/ˈloʊənˌθɔːl/; born March 8, 1941) is an American politician who served as the U.S. representative for California's 47th congressional district from 2013 to 2023.

[8] The 47th district includes the Los Angeles County communities of Avalon, Long Beach, Signal Hill, Lakewood, Cerritos, Artesia, Bellflower, Downey, South Gate, Lynwood, Paramount, Hawaiian Gardens, Florence-Graham and Willowbrook.

It also extends to the western Orange County cities of Garden Grove, Westminster, Stanton, Buena Park, Los Alamitos, and Cypress, and includes Catalina Island.

Legislation that Lowenthal had signed into law include a law to reduce diesel emissions at the ports by limiting idling time for trucks conducting transactions at the ports, a bill that established a grant program to provide financial incentives for purchasing or leasing electric vehicles, and a bill to protect highways.

On November 6, 2012, Lowenthal was elected to the U.S. House of Representatives from the newly created 47th district after defeating Republican Gary DeLong.

Lowenthal is the first non-Hispanic Democrat to represent a significant portion of traditionally heavily Republican Orange County in Congress since Jerry M. Patterson, who served from 1975 to 1985.

In March 2019 he and 29 other Democratic lawmakers wrote Secretary of State Mike Pompeo a letter that read in part, "Since the election of far-right candidate Jair Bolsonaro as president, we have been particularly alarmed by the threat Bolsonaro’s agenda poses to the LGBTQ+ community and other minority communities, women, labor activists, and political dissidents in Brazil.

[21][22] He opposed the overturning of Roe v. Wade, calling it "devastating to every American woman who has, with the stroke of a pen, had their rights curtailed and their status as free and equal citizens abridged.

His other son, Josh, ran for State Assembly in 2018 in the 72nd district, which was being vacated by Travis Allen, but lost to Tyler Diep.