A list of notable events related to The Hardy Boys that happened in the 1970s.
- The first comics in a series of comic books, based on animated Hardy Boys television series, are published by Gold Key Comics.
- The animated Hardy Boys television series is discontinued, as well as the spin-off Gold Key Comics line.
- A Hardy Boys television series, entitled The Hardy Boys/Nancy Drew Mysteries, staring Parker Stevenson as Frank Hardy and Shaun Cassidy as Joe, premieres with episode #1 The Mystery of the Haunted House. This is the first in a long line of Hardy Boys/Nancy Drew crossovers in novels, television, and video games.
- The Hardy Boys #58 The Sting of the Scorpion is the last new title published by Grosset & Dunlap, the publisher of the series since the beginning in 1927. All following titles are published by Simon & Schuster, Grosset & Dunlap only retaining rights to publish the first 58 volumes.
- The Hardy Boys #59 Night of the Werewolf, the first book to be published by Simon & Schuster, is published under their Wanderer Books imprint.
- The Hardy Boys/Nancy Drew Mysteries series goes off the air after three seasons and several format changes.
- September 6 - Leslie McFarlane dies.
1920s: 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929