Was the musical Annie an adaptation from a book?

Yes, the musical "Annie" is based on the comic strip "Little Orphan Annie" by Harold Gray. The comic strip was first published in 1924 and was a popular feature in newspapers across the United States. The musical adaptation of the comic strip was written by Thomas Meehan, with music by Charles Strouse and lyrics by Martin Charnin. The musical premiered on Broadway in 1977 and was a critical and commercial success. The musical has been adapted into several films and television productions.