Special K is a single by British alternative rock band Placebo. It is taken from their third album. The song has many drug references. The "K" in the title refers to the drug ketamine. Other lines in the song such as, "I swallowed half my stash," and, "I fall down... hit the ground," give references to crashes or down as well as drug stashes.

The video is reminiscent of sci-fi films such as Fantastic Voyage.