The Tony Award for Best Book of a Musical is awarded to librettists of the spoken, non-sung dialogue, and storyline of a musical play. Eligibility is restricted to works with original narrative framework; plotless revues and revivals are ineligible. This award was originally called the Tony Award for Best Author, until musicals were split off from dramas.

Winners and nominees

1940s

1950s

1960s

1970s

1980s

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