When was the first Spider-Man introduced?

Amazing Fantasy #15

The first appearance of Spider-Man was in 1962, in Amazing Fantasy #15. He then appeared in his own comic Amazing Spider-Man.

You dumbos it waz in 100 B.C.

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Spider-man wasn't introduced. He always was and always will be.

lol Stan Lee's editor said "A guy dressed like a spider will never sale!" HA! Look at puny Parker now!!

----Flaming-Spider

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Spider-Man's first appearance was in the final issue of Amazing Fantasy #15, previously called Amazing Adult Fantasy and prior to that Amazing Adventures in August 1962. He appeared in his own title the Amazing Spider-Man in March the following year. I hope this is of some help to you.

Amazing Fantasy #15 (1962)