John Weidman is an American librettist and television writer for "Sesame Street". He has worked on stage musicals with Stephen Sondheim and Susan Stroman. He has written the books for a wide variety of stage musicals.

He collaborated on three stage musicals with Stephen Sondheim. The first book for a musical that he wrote was Pacific Overtures, as an intern for Hal Prince.The musical premiered on Broadway in 1976, and was revived in 2004 at Studio 54. Assassins first opened Off-Broadway in December 1990 at Playwrights Horizons,  and later opened in the West End in October 1992 at the Donmar Warehouse. The musical was revived on Broadway in 2004 in a Roundabout Theatre Company production. Road Show, after several title changes, opened Off-Broadway at the Public Theater in 2008. The musical had productions at the Goodman Theatre and Kennedy Center in 2003 prior to the Off-Broadway production.
Weidman has worked with choreographer/director Susan Stroman three times. He wrote the book for the musical Big: the musical, with Stroman as choreographer. The musical opened on Broadway in April 1996 at the Shubert Theatre. He and Stroman co-created the Tony Award-winning musical Contact, which opened Off-Broadway in October 1999 at the Newhouse Theatre at Lincoln Center and on Broadway at the Vivian Beaumont Theatre in March 2000. He wrote the book for the new musical Happiness, which ran at Lincoln Center in February 2009. Directed and choreographed by Stroman, the composer was Scott Frankel with lyrics by Michael Korie.