Marwan Yousef Mohamed Rashid Lekrab al-Shehhi was an Emirati terrorist hijacker from al-Qaeda who served as the hijacker-pilot of United Airlines Flight 175, crashing the Boeing 767 into the South Tower of the World Trade Center as part of the 11 September attacks in 2001. He was one of five hijackers aboard the aircraft and one of two Emiratis to take part in the attacks, the other being Fayez Banihammad, who helped him hijack the same plane.

United Airlines Flight 175 was a domestic passenger flight from Logan International Airport in Boston to Los Angeles International Airport in California that was hijacked by five al-Qaeda terrorists on the morning of September 11, 2001, as part of the September 11 attacks. The aircraft involved, a Boeing 767-200 carrying 65 passengers and crew, was deliberately crashed into the South Tower of the World Trade Center in New York City, killing everyone aboard and causing the deaths of more than 600 people in the South Tower's upper levels in addition to an unknown number of civilians and emergency personnel on floors beneath the impact zone. Flight 175's hijacking not only led to it being the second-deadliest of the four suicide attacks carried out on the day in terms of plane and ground fatalities, but also secured its place as second-deadliest plane crash in aviation history, surpassed only by American Airlines Flight 11.