Les Millions d'Arlequin (English: Harlequin's Millions) (Russian: "Миллионы Арлекина", Milliony Arlekina) also known under the title Harlequinade (Russian: "Арлекинада", Arlekinada) is a ballet comique in two acts and two tableaux with libretto and choreography by Marius Petipa and music by Riccardo Drigo.

The Sérénade from the first act of the ballet became a popular repertory piece that has been arranged for various instruments and recorded on numerous occasions.

Les Millions d'Arlequin was first performed on a double bill after two acts of Alexander Serov's opera Judith at the Imperial Theatre of the Hermitage Museum on 23 February [O.S.

In the principal roles were Mathilde Kschessinskaya as Columbine, Georgy Kyaksht as Harlequin, Olga Preobrajenskaya as Pierrette, Sergei Lukianov as Pierrot, Enrico Cecchetti as Cassandre, Nikolai Aistov as Leandre, and Anna Urakova as the Good Fairy.

Private royal theatrical performances of that time were extremely formal affairs where rigid etiquette and protocol were strictly adhered to, and as such applause or cheering were not permitted.

But much to the surprise of everyone present, the composer Drigo received such a reception after the performance that he was mobbed by several princes and Grand Dukes who tripped over one another in their enthusiasm to congratulate him for his music.

The Empress Alexandra admired the ballet, and commanded two additional court performances, this time on the stage of the Mariinsky Theatre, the first being given on 26 February [O.S.

Marius Petipa's choreography for Les Millions d'Arlequin was recorded in the Stepanov method of choreographic notation not long after its premiere in 1900.

After the premiere of Les Millions d'Arlequin in 1900, plans were underway by the music publisher Zimmermann to issue Riccardo Drigo's score in both piano reduction and orchestral partition.