Alexina Diane Louie, OC OOnt FRSC (born 30 July 1949), is a Canadian composer of contemporary classical music.

Louie has twice won a Juno Award for Best Classical Composition: in 1989 for Songs of Paradise (1984), and in 2000 for Shattered Night, Shivering Stars (1997) - both are orchestral works.

Louie's works of chamber music include The Distant Shore for piano trio, Edges for string quartet, Music from Night's Edge for piano quintet, Riffs for oboe, clarinet and bassoon, and Gallery Fanfares, Arias and Interludes (commissioned by the Art Gallery of Ontario in 1993).

[9] In 1999 she won the Jules Léger Prize for New Chamber Music for Nightfall, a work for 14 strings written for I Musici de Montreal.

The Scarlet Princess, which was premiered by the Canadian Opera Company in 2002, is an erotic ghost story based on a 17th-century Japanese Kabuki play.

Her eight-minute comic mini-opera entitled, Toothpaste (1995),[needs update] based on a libretto by Dan Redican, has been broadcast in more than a dozen countries.

[citation needed] Songs of Paradise was re-recorded by the Thunder Bay Symphony Orchestra and Music Director Geoffrey Moull in 2004, and subsequently released on the album, Variations on a Memory.