Is Jell-O vegan?

Not animal fat. Animal bone. Usually pigskin as well.

Which is why Orthodox jews won’t eat it, see this:https://recipes.howstuffworks.com/j-ello.htm

Jello, and most other products containing actual gelatin (which is what is in Jello) is neither vegan, nor vegetarian. It is made of the connective tissue of animals, the leftover parts from the slaughtering process, rather than the meat.

There are vegan “gelatin” options that are very tasty. You can read about that here: https://www.peta.org/living/food/vegan-gelatin/

I have tried the Simply Delish brand and it is very good.

According to tastessence there is a version which is made from cow & pig bones & skins, a Kosher version made from fish bones & beef skins, & a Vegan version made from agar…a seaweed derivative. Root of Kuzu, guar gum, & carrageenan are vegan gelatin.

And gelatin is one of those things that’s in a staggering number of products. Shit like that is why it can be so difficult to maintain a strict vegan diet.

Well if it’s made from animals vegans can’t eat it, right?

Obviously.