Katherine Lauren Hill (born August 25, 1987) is an American former politician and social services administrator from Agua Dulce, California. A member of the Democratic Party, she served as the U.S. representative for California's 25th congressional district from January to November 2019. Hill is the former executive director of People Assisting the Homeless (PATH), a statewide non-profit organization working to end homelessness throughout California. She won her seat by defeating incumbent Republican Steve Knight in the 2018 midterm elections.

On October 18, 2019, RedState, a conservative blog, published a report on an alleged affair between Hill and her Legislative Director, which they both denied. On October 23, 2019, Hill admitted that she had had an inappropriate relationship with a campaign staffer before she became a Member of Congress. On October 27, 2019, she announced that she would resign from Congress. Nude photos of Hill were published by the Daily Mail, a British tabloid. Hill blamed the release of the photos on her ex-husband, called them an invasion of privacy and vowed to advocate for victims of revenge porn. She resigned on November 3, 2019, and left office two days later.

In June 2021, Hill was ordered to pay US$220,000 to the Daily Mail and other media, to reimburse the legal fees these companies spent defending themselves against her accusations.