MKL may refer to:

• Math Kernel Library, an Intel software library
• Multiple kernel learning
• FAA Identifier for McKellar-Sipes Regional Airport

• Double action revolver
• Double Act (TV film)
• Double Acute Accent
• Double Adobe Elementary School District
• Double affine braid group
• Double affine Hecke algebra
• Double-agent
• Double Agent (2003 film)
• Double Agent (film)
• Double algebra
• Double Alibi
• Double All Black
• Double-arch dam
• Double aria
• Double arm DDT
• Double arrow space
• Double-arrow space
• Double-articulated bus
• Double Ascension
• Double Ascension (Bayer)
• Double-A side
• Double A (Singer)
• Doubleback
• Doubleback (disambiguation)
• Double Back: Evolution of R&B