Here's another thread about this sort of bidness.
Here's my list:
1. Mad Monster Party? (1967)
2. Disney's "The Adventures of Ichabod & Mr. Toad" (Legend of Sleepy Hollow) (1949)
3. Garfield's Halloween Adventure (1985)
4. Halloween (1978)
5. Halloween 3 (1982)
6. Will Vinton's Claymation Comedy of Horrors (1991)
7. The Wicker Man (1973)
8. Trick 'r Treat (2007)
9. Tales From the Darkside's Pilot Episode: Trick or Treat (1983)
10. Nightmare Before Christmas (1993)
Since these lists can be longer than 10, I hafta add The Great Pumpkin, of course.