Adam Castillejo (born 1979 or 1980), also known as "The London Patient", is the second person known to have been cured of HIV infection. Castillejo, who is British-Venezuelan and has mixed European ancestry, lives in London. He has previously worked as a chef and is now a motivational speaker.

Diagnosed in 2003, his body became resistant to HIV infection after receiving a bone marrow transplant in 2016 to treat Hodgkin's lymphoma. The German donor carried the CCR5-Δ32 mutation which gives resistance from HIV infection. He was treated by Professor Ravindra Gupta.