Betsy and Tacy Go Over the Big Hill (1942) is the third volume in the Betsy-Tacy series by Maud Hart Lovelace.

[1][2][3] The book, along with the entire Betsy-Tacy and Deep Valley series, was republished in 2000 by HarperTrophy with a new cover art illustrated by Michael Koelsch.

The girls are competing with Betsy's and Tacy's older sisters about having a Queen of Summer.

When they go out to collect votes, they find themselves making friends with a surprising little girl their own age in the Little Syria section of Deep Valley, Minnesota.

Betsy and Tacy first sing their "Cat Duet" at the school entertainment in this book.