enamored of/enamored by/enamored with

"I'm completely enamored by the water buffalo." Wrong! No, you're not. I'll explain what you're really implying here in a minute.

If your intended meaning is you find the water buffalo fascinating, you are enamored "of" it. Use "of" when making reference to people or objects.

We can also throw in the phrase "enamored with," as this one is used quite often. In this context, it usually refers to a scene of some sort. "I was enamored with the beauty of the Grand Canyon."

If you really like that water buffalo, use the "of" form. What you're really saying when you use "enamored by" is the water buffalo finds you fascinating and has the greatest amount of admiration for you -- highly unlikely, unless it's a special water buffalo.

Do you really think a water buffalo would find you that interesting? Doubtful.