L5

L5 or L-5 may refer to:

• L5 Society, society promoting Dr. Gerard K. O'Neill's vision of space colonization

In entertainment:

• L5 (band), French female pop music group
• L5 Games, video games developer published by Gravity Interactive
• Gibson L5, electric guitar
• Home on Lagrange (The L5 Song)

In science:

• Haplogroup L5 (mtDNA), human mitochondrial DNA haplogroup
• Lagrangian point#L4 and L5 in an astronomical Solar System
• Lp space for p=5
• Ribosomal protein L5, a human gene
• Ubiquitin carboxyl-terminal hydrolase L5, a human gene

In transportation:

• L-5 Sentinel, aircraft used by the United States Army Air Forces in World War II
• Barcelona Metro line 5
• HMS L5, a 1917 British L class submarine
• Junkers L5, a 1920s German six-cylinder, water-cooled, inline aircraft engine
• PRR L5, an American electric locomotive
• SP&S Class L-5, a 1897 steam locomotives class
• Strv L-5, a 1929 Swedish tank designed by Landsverk
• USS L-5 (SS-44), a 1916 United States Navy L-class submarine