The Bobbsey Twins are the principal characters of what was, for many years, the Stratemeyer Syndicate's longest-running series of children's novels, penned under the pseudonym Laura Lee Hope. The first of 72 books was published in 1904, the last in 1979, with a separate series of 30 books published from 1987 through 1992. The books related the adventures of the children of the upper-middle-class Bobbsey family, which included two sets of fraternal twins: Bert and Nan, who were 12 years old, and Flossie and Freddie, who were six.
Edward Stratemeyer himself is believed to have written the first volume in its original form in 1904. When the original series was brought to its conclusion in 1979, it had reached a total of 72 volumes. At least two attempts to restart the series were launched after this, but neither effort saw the popularity that the original series achieved.
Speculation that Stratemeyer also wrote the second and third volumes of the series is believed to be incorrect; these books are now attributed to Lilian Garis, wife of Howard Garis, who is credited with volumes 4–28 and 41. Elizabeth Ward is credited with volumes 29–35, while Harriet Stratemeyer Adams is credited with 36–38, 39 (with Camilla McClave), 40, 42, 43 (with Andrew Svenson), and 44–48. Volumes 49–52 are attributed to Andrew Svenson, while 53–59, and the 1960s rewrites of 1–4, 7, 11–13, and 17, are attributed to June Dunn. Grace Grote is regarded as the real author of 60–67 and the rewrites of 14 and 18–20, and Nancy Axelrad is credited with 68–72. Of the 1960s rewrites not already mentioned, volumes 5 and 16 are credited to Mary Donahoe, 6 and 25 to Patricia Doll, 8–10 and 15 to Bonnibel Weston, and 24 to Margery Howard.
Main characters 
- Mr. Richard Bobbsey, the owner of a lumber yard in Lakeport
- Mrs. Mary Bobbsey, his wife
- Nan Bobbsey, their elder daughter, Bert's twin
- Bert Bobbsey, their elder son, Nan's twin
- Freddie Bobbsey, their younger son, Flossie's twin
- Flossie, their younger daughter, Freddie's twin
- Dinah Johnson, the Bobbseys' Negro cook, Sam's wife
- Sam Johnson, the Bobbseys' man of all work, Dinah's husband
- Snoop, the Bobbseys' cat
- Snap, the Bobbseys' dog
- Danny Rugg, a "bad boy"
In the original editions, the first books in the series (like those in previous Stratemeyer series) took place in a clear chronology, with the characters aging as time passed. The Bobbsey Twins: Merry Days Indoors and Out took place over the course of a school year, with Nan and Bert described as eight years old and Freddie and Flossie four. The second book, The Bobbsey Twins in the Country is set at the beginning of the following summer. The second part of the summer is chronicled in The Bobbsey Twins at the Seashore, which is written as a direct sequel to the previous book, tying up some plot threads. The fourth book, The Bobbsey Twins at School, begins the next autumn, with Nan and Bert "nearly nine years old" and Freddie and Flossie "almost five." Editors at the Stratemeyer Syndicate quickly realized that at this rate their young heroes would quickly age beyond their readership, and so the later books in the series (and in all revised editions) take place in a sort of chronological stasis, with the older twins perpetually 12 years old and the younger set 6.
The earliest Bobbsey books were mainly episodic strings of adventures; with the growing popularity of the Hardy Boys and Nancy Drew, detective plots began to dominate the series. Even so, few of the mysteries involved violent crime, and quite a few did not involve any crime at all.
While many of the early volumes were constructed from whole cloth, with little or no connection to the real world, by 1917 (The Bobbsey Twins in a Great City, vol. 9, rewritten in 1960 as The Bobbsey Twins' Search in the Great City) they were beginning to visit real places, and by the 1950s (The Bobbsey Twins at Pilgrim Rock vol. 50), those visits to real places were as well-researched as any fictional visits to real places. By 1971, when the Bobbseys visited Colonial Williamsburg (The Bobbsey Twins' Red White and Blue Mystery, vol. 64), real places were being depicted in meticulous detail, down to the names of well-known hotels and restaurants (and, in that particular case, even the color of Colonial Williamsburg shuttle buses).
It is said that vol. 68, The Bobbsey Twins on the Sun-Moon Cruise, was the result of a research trip for a proposed Nancy Drew book: Harriet Stratemeyer Adams and Nancy Axelrad (her personal assistant at the time) took an actual eclipse cruise but, when they returned, the publisher was more interested in a new Bobbsey title.
Post-1960 rewrites 
In 1960, the Stratemeyer syndicate began to rewrite most of the older volumes, many of which became almost unrecognizable in the process. This was done concurrently with the release of a new edition of the series, with picture covers, no dust jackets, and a lavender spine and back cover (replacing the various green bindings that had been used before). Many of the cover paintings were originally dust-jacket paintings that had been added in the 1950s (before which a single common dust-jacket painting had been used throughout any given edition), but most were new with the "purple" edition. In all, 20 were completely rewritten, all but two with modernized titles, while 16 were never released in this edition, evidently having been deemed to be dated beyond repair.
Most of the rewrites were motivated by changing technology (automobiles replacing horses and buggies) or changing social standards, particularly in how Sam and Dinah were portrayed. The Bobbsey Twins and Baby May received what is regarded as the most extreme rewrite; it is a story about the Bobbsey family's adventures trying to find the parents of a foundling baby. Since, by the 1960s, modern social services had rendered the original story utterly implausible, an entirely new novel was written about the twins' adventures with a baseball-playing baby elephant (The Bobbsey Twins' Adventures with Baby May). This, however, had a ripple effect, as the original The Bobbsey Twins at Cherry Corners had been a sequel to the original Baby May. Thus, a second book, The Bobbsey Twins: The Mystery at Cherry Corners, was written. It incorporated only a very little bit of material from its original version.
New Bobbsey Twins 
Starting in 1987, a numbered series of paperback originals branded The New Bobbsey Twins were released by Minstrel Books, an imprint of Pocket Books. Featuring all-new stories, the series ended with volume 30, The Mystery of the Mixed-Up Mall, in 1992.
In her book The Rhetoric of Character in Children's Literature, Maria Nikolajeva refers to the twins as a "simple duplication of protagonists.
- Keeline, James D., The Writers of the Bobbsey Twins
- New Bobbsey Twins (1987-1992)
- Nikolajeva, Maria (2002). The Rhetoric of Character in Children's Literature. Scarecrow Press. p. 278. ISBN 0-8108-4886-4.
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- A general commentary on the series as a whole
- The Bobbsey Twins' Page by Michael P. Weinstein, Nashua, New Hampshire
- Works by Laura Lee Hope at Project Gutenberg
- Keeline, James, D. "Bobbsey Twins Formats" (2000)