• one of three babies in a multiple birth
• Opal in preparation to be a gemstone
• Tuple of length 3 in mathematics
• Tuplet in music
• Tercet in poetry
• Spin triplet in quantum mechanics — as in triplet oxygen, or simply triplet state in general.
• Tandem bicycle with three seats
• Photography triplet or paint triplet
• J-coupling as part of NMR spectroscopy

The Triplets may refer to:

• The Triplets, a Catalan children's book
• The Triplets (band), a Latin pop group
• Troy Aikman, Emmitt Smith, and Michael Irvin of NFL fame from 1990-1999
• Binghamton Triplets, a minor league baseball team
• The Gregory Triplets, Welsh actors and models

See also

• Les Triplettes de Belleville, a 2003 french animated film by Sylvain Chomet
• Triptych, a work of art which is divided into three sections
• First Hurwitz triplet