The earliest film that could be called a slasher, Thirteen Women (1932).
Even though Psycho (1960) is called "The mother of all slasher films", Peeping Tom (1960) was released 3 months before.
The 1978 Halloween film cannot be beaten, especially for a slasher movie in that era.
Caught by the Coupon Craze - 1909 was released on: USA: 16 July 1909
The North Pole Craze - 1909 was released on: USA: 7 October 1909
Grave Yard Shift
1964
its craze
A horror slasher movie.
Redrum - 2013 Scene from a Slasher Movie SUSPENDED was released on: USA: January 2013
Hellraiser.
slasher movie
Scotsman, Lonnie Donnegan
The craze of Android started on October 2003
ChildsplayTucker & Dale vs. Evil
Movie Macabre - 1981 Craze 2-19 was released on: USA: 29 January 1983
Secret Agent Man
Presumably. It is marketed as a slasher horror movie.
Student Bodies