The Tony Award for Best Original Score is the Tony Award given to the composers and lyricists of the best original score written for a musical in that year. The score consists of music and lyrics. To be eligible, a score must be written specifically for the theatre and must be original; compilations of non-theatrical music or compilations of earlier theatrical music are not eligible for consideration.
The award has undergone a number of minor changes. In 1947, 1950, 1951, and 1962, the award went to the composer only. Otherwise, the award has gone to the composer and lyricist for their combined contributions, except for 1971 when the two awards were split (although Stephen Sondheim won both, for Company).