Christina Marie Houlahan (/ˈhuːləhæn/ HOO-lə-hann; née Jampoler; born June 5, 1967) is an American politician, engineer, and former United States Air Force officer. A member of the Democratic Party, she is serving as the U.S. representative from Pennsylvania's 6th congressional district since 2019. The district includes almost all of Chester County, a suburban county west of Philadelphia, as well as the southern portion of Berks County including the city of Reading. She was first elected in 2018, defeating Republican Greg McCauley in the midterms.

Houlahan spent her childhood on various U.S. naval bases across the country, including on Oahu. Her father, Andrew C. A. Jampoler, a naval aviator, was born in Lviv, Ukraine, in 1942, to a Jewish family; he and his mother, who also survived the Holocaust, emigrated to the United States when he was four years old. He became a historian and author.

Houlahan, citing her idols as Indiana Jones and Sally Ride, earned her bachelor's degree in engineering from Stanford University in 1989, on an AFROTC scholarship. She then earned a master's degree in Technology and Policy from the Massachusetts Institute of Technology in 1994.

After graduation from Stanford University, Houlahan spent three years on United States Air Force active duty at Hanscom Air Force Base in Bedford, Massachusetts. There, she served as a project manager working on air and space defense technologies. She left active duty in 1991 for the Air Force Reserve, separating from the service in 2004 as a captain.

After leaving active duty, Houlahan went to work for the start-up sportswear company AND1 as chief operating officer. As part of the employee benefits program the company offered 40 paid hours of community service at a location of the employee's choosing. Houlahan dedicated her hours to working with girls and women in science, technology, engineering, and math (STEM). Houlahan became chief operating officer of B-Lab, a non-profit start-up, when AND1 was sold.

Citing a need to experience the problems in the U.S. educational system first-hand, Houlahan entered the lifelong learning program at University of Pennsylvania where she re-took courses in the hard sciences. She enrolled in the Teach for America program and began working as an 11th-grade science teacher at Simon Gratz High School in Philadelphia. She withdrew from the Teach for America program after one year and joined Springboard Collaborative, a Philadelphia-based nonprofit focusing on early childhood literacy in underserved populations nationwide. Houlahan served as both president and CFO/COO of Springboard Collaborative before leaving to focus on her political campaign.

Houlahan has said that one of the experiences that motivated her to run for Congress was her organization of a bus trip to the Women's March in Washington, D.C., on January 21, 2017. When asked why she chose to begin her political career by running for Congress and not a lower office, she said, “I don't have time for that. The stakes are too high, and I think I'm qualified."

Houlahan expected to face two-term Republican incumbent Ryan Costello. However, Costello pulled out of the race after the Supreme Court of Pennsylvania threw out Pennsylvania's congressional map as an unconstitutional partisan Republican gerrymander. While Costello was the only incumbent to retain his previous district number, it was made significantly more compact and turned from a Republican-leaning swing district into a strongly Democratic district. It lost its heavily Republican western portion around Lebanon, which had only been connected to the rest of the district by way of a tendril through Berks County. Instead, it now took in almost all of Chester County (except for a sliver around Birmingham Township that was drawn into the neighboring 5th district), along with the heavily Democratic southern portion of Berks County, including Reading.