Diary of an Antibody is the second album by the English indie pop band Fosca. It was released on August 12, 2002.
AllMusic wrote that Fosca "once again prove why their new wave-inspired sound, while often inspired by the sounds of yesterday, are fresh and exciting, without the slightest hint of sounding contrived." Exclaim! wrote that "they have a well-coiffed, well-dressed singer (Dickon Edwards), all the right synth-heavy instrumentation and campy subject matter, but somehow the final result doesn't have the punch that it should." Scram Magazine called the album "precious and arch London pop."