L5 or L-5 may be: L5 (band), a French female pop music group L5 Games, a video games developer published by Gravity Interactive, 5th film in the Leprechaun series L5-like viruses, a type of Siphoviridae viruses L-5 Sentinel, an aircraft used by the United States Army Air Forces in World War II L5 Society, a society promoting Dr. Gerard K. O'Neill's vision of space colonization Gibson L5, an electric guitar Haplogroup L5 (mtDNA), a human mitochondrial DNA haplogroup HMS L5, a 1917 British L class… (More on L5)