|Day of the Dinosaur|
|Author||Franklin W. Dixon|
|House name||Franklin W. Dixon|
|Publication date||October 1994|
|Media type||Print (softcover)|
|Preceded by||Reel Thrills|
|Followed by||The Treasure at Dolphin Bay|
Day of the Dinosaur is the 128th book in The Hardy Boys series.
Frank and Joe visit the museum one of their friends works at. However, almost as soon as they arrive trouble begins, Joe is lifted up by the head of an Apatosaurus. Someone is causing the robotic dinosaurs to attack people. If the Hardy boys don't solve the case, the saboteur will make the museum extinct.