Trixie Belden is the title character in a series of "detective" mysteries written between 1948 and 1986. The first six books were written by Julie Campbell Tatham, who also wrote the Ginny Gordon series; the stories were then continued by various in-house writers from Western Publishing under the pseudonym Kathryn Kenny. Today the rights to the series are owned by Random House. The series was out of print for a number of years, but Random House began releasing a new edition of the books in mid-2003. As of mid-2006, volumes 1 – 15 have been reissued.

Beatrix "Trixie" Belden is a young teen living just outside the fictional town of Sleepyside-on-Hudson, in the Hudson Valley area of New York. She lives at Crabapple Farm, which had been in her family for either three or six generations (this varies between books), with her parents and three brothers, Brian, Mart, and Bobby. The first book establishes her friendship with lonely, sheltered rich girl Honey Wheeler, whose family has just moved into the Manor House next door and soon the girls are embroiled in their first case.

Throughout the series, the two girls solve mysteries that baffled authorities and, along with brothers and friends, form a club called the Bob-Whites of the Glen, have adventures, travel (though not as extensively as Nancy Drew, an older and more sophisticated girl sleuth), and struggle with school. Trixie has particular difficulties with math.

With the advent of Internet fan-supported Web sites, many Trixie Belden-related sites have been created. On many of these sites, comparisons are made between Trixie and Nancy Drew. Fans of Trixie Belden usually cite her more realistic persona as a teenager who grumbles about chores and is often frustrated by life with both older and younger brothers. Trixie also experiences some insecurity about her looks, often comparing herself unfavorably with her friends, Honey and Diana, who are regarded as more obviously attractive.

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