Oooh, this is a toughie as I have several.
My very favourite would have to be the pilot episode "I, Darrin, Take This Witch, Samantha."
It's the beginning of the Samantha and Darrin love affair and where we discover that Samantha is a witch,I still love that as much today as I did over 30 years ago when I first watched it as a child.
My other Bewitched top favs are:
"A Is For Ardvark"
"A Vision Of Sugar Plums"
"And Then There Were Three" (when Tabatha is born)
"Samantha's Thanksgiving To Remember"
"If They Never Met"
The list is endless. Bewitched made 254 episodes in all so I'm bound to have quite 'a few' favourites.

I agree with cammie,there are too many to choose from,if i had to choose my top three would be. 1st A Vision Of Sugar Plums 2nd I Darrin,Take This Witch 3rd Theres No Witch Like An Old Witch

I love love all of the episodes with aunt Clara. I also love all Serena episodes and anything with phyliss was good. Okay I love them all!!

Thats hard to say but I think mine are I, Darrin Take This Witch to be my Bride, Snob in The Grass

Golfing against bill baxter lol