Danny Dunn is the name of a fictional character and protagonist of a series of juvenile science fiction/adventure books written by Raymond Abrashkin and Jay Williams, in the 1950s, 1960s, and 1970s. The stories were set in the fictional American town of Midston and featured characters who were interested in science and math.
Raymond Abrashkin suffered from paralysis and died after the fifth book. Williams, however, insisted on Abrashkin being given co-author credit on the subsequent books as well, since he had been instrumental in constructing the series. Ezra Jack Keats illustrated the first four novels in the series.
- Professor Euclid Bullfinch, a researcher at the fictional Midston University. The professor was also a musician who played the bass viol (also known colloquially as the "bull fiddle"). He is plump and somewhat bald.
- Teenager (some books depicted an elementary school setting) Danny Dunn, who would always get into complicated problems involving the professor's latest invention. Danny is looking forward to a career in science, and admires Professor Bullfinch as a mentor.
- Mrs. Dunn, Danny's widowed mother, who was a live-in housekeeper for Professor Bullfinch.
- Teenager Irene Miller, Danny's friend and next-door neighbor. Irene's father taught Astronomy at Midston University. Irene was particularly interested in biology.
- Teenager Joe Pearson, Danny's friend. Joe was the poet of the group. He often functioned as an amusing sidekick to Danny, expressing bafflement at the complicated technology employed by Danny and the Professor.
- Teenager Eddie (Snitcher) Phillips, rival of Danny
- Doctor A.J. Grimes, a friend of Professor Bullfinch introduced in the first book, Danny Dunn and the Anti-Gravity Paint. Grimes is a curmudgeonly figure, rarely taking the teenagers seriously, and often trying to antagonize the Professor. Doctor Grimes was also a musician who played the piccolo; he and Professor Bullfinch would on occasion play duets. Tall and lanky, he is in many ways a contrast to his friend Bullfinch.
- Danny Dunn and the Anti-Gravity Paint (1956)
- Danny Dunn on a Desert Island (1957)
- Danny Dunn and the Homework Machine (1958) (Irene introduced)
- Danny Dunn and the Weather Machine (1959)
- Danny Dunn on the Ocean Floor (1960)
- Danny Dunn and the Fossil Cave (1961)
- Danny Dunn and the Heat Ray (1962)
- Danny Dunn, Time Traveler (1963)
- Danny Dunn and the Automatic House (1965)
- Danny Dunn and the Voice from Space (1967)
- Danny Dunn and the Smallifying Machine (1969)
- Danny Dunn and the Swamp Monster (1971)
- Danny Dunn, Invisible Boy (1974)
- Danny Dunn Scientific Detective (1976)
- Danny Dunn and the Universal Glue (1977)
- Danny Dunn and the Homework Machine was turned into a musical children's album on Golden Records (Golden LP 239), with music composed by Julie Mandel.