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Tropak (Ukrainian: трoпак) or trepak (Russian: трeпак; Ukrainian: тріпак)^[1] is a traditional Russian and Ukrainian folk dance.^[2]

The tropak shares many musical and choreographic characteristics with the better known hopak. Both developed as Cossack social dances, performed at celebratory occasions. The tropak differs from the hopak in chordal use and also in that the tempo gradually speeds up throughout the dance.

The dance is a brisk allegro in ²
₄ time in a major key. Accompaniment is usually on two alternating chords; dominant and tonic.

One of its best known representations is Pyotr Ilyich Tchaikovsky's "Trepak" (also known as the "Russian Dance") from the ballet The Nutcracker. The dance music was also used in the last movement of his Violin Concerto in D major, Op. 35. The third of Modest Mussorgsky's Songs and Dances of Death is named "Trepak".

Traditional Tropak choreography did not survive except a simple walk with a syncopated stamp, often done to a quick duple meter rhythm.

On So You Think You Can Dance (Season 4), Joshua Allen and Stephen "Twitch" Boss performed a Trepak routine, interpreted as a dance duel, in Week 9 (August 6, 2008).

• Hopak