Panayiotis "Ben" Agathangelou (born 4 November 1971 in Hackney, London) is a Greek-British automotive engineer, specialising in aerodynamics, who currently works for the Haas F1 Team. He has been with a number of successful Formula One teams.
Agathangelou studied aeronautics and astronautics at the University of Southampton before joining the McLaren F1 team in 1994, where he stayed for three years. After a year at Tyrrell, he moved to Honda and helped to design the Honda RA099 test car, which was ultimately never raced due to the sudden death of Harvey Postlethwaite, the project's technical director, and it took a few years for them to properly race.
Ben was hired by Benetton in 1999, before moving to Jaguar two years later. He designed the team's 2003 car, the R3, and the first Red Bull cars after the team was sold to the drinks company in 2005. He left the team in 2007 after a personnel shake-up caused by the arrival of Adrian Newey.
Ben returned to Formula One in 2010 after being recruited by the new Hispania Racing (HRT) F1 Team, and then moved to Scuderia Ferrari. He took up the position of chief aerodynamicist at the new Haas F1 Team in March 2015.