Every Stan Lee Cameo (1989 – 2018)
According to the comments on YouTube, this compilation may have missed a few cameos and a couple of the dates of the films are incorrect, but this is still the most comprehensive compilation I could find online (up to and including Thor: Ragnarok).
Sadly, the legendary comic book creator passed away on November 12, 2018.
In collaboration with several artists – particularly Jack Kirby and Steve Ditko – he co-created Spider-Man, the Hulk, Doctor Strange, the Fantastic Four, Daredevil, Black Panther, the X-Men, and – also with co-writer Larry Lieber – Ant-Man, Iron Man, and Thor. [source]