Triple metre (or triple meter, also known as triple time) is a musical metre characterized by a primary division of 3 beats to the bar, usually indicated by 3 (simple) or 9 (compound) in the upper figure of the time signature, with 3/4, 3/2, and 3/8 being the most common examples. The upper figure being divisible by three does not of itself indicate triple metre; for example, a time signature of 6/8 usually indicates compound duple metre, and the 12/8 sections of Beethoven's Missa Solemnis are compound double with a primary division of four to the bar.

It is reasonably common in ballads and classical music but much less so in genres such as rock & roll and jazz. The most common time in rock, blues, country, funk, and pop is quadruple. Although jazz writing has become more adventurous since Dave Brubeck's seminal Time Out,^{[citation needed]} the majority of jazz and jazz standards are still in straight quadruple time.

Triple time is common in formal dance styles, for example the waltz, the minuet and the mazurka.