Is there such a thing as an Army OCS class ring?

We don't need no stinking rings!!!!! CPT Chris Loomis

That would just confuse the ring-knockers -- LOL.

The short answer is sure. You can get a class ring made for anything if you are willing to pay for it.

Realistically though class rings are typically for classes much longer than OCS. Such as high school to a lesser degree and college mainly.

Although I personally wouldn't disparage you for getting an OCS class ring you would probably catch a decent amount of flak from citadel and academy grads as well as other college grads who wear their rings.