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OCaml has a sophisticated object system. See:

https://realworldocaml.org/v1/en/html/objects.html

You can do a lot of traditional 'OO'-style things with functors and modules, though, so you don't need objects necessarily to get a lot of OO features.

OCaml is (somewhat unconventionally) object-oriented; it has classes, inheritance, what-have-you. The 'O' in the name stands for "objective". Perhaps you're thinking of SML?

See: http://caml.inria.fr/pub/docs/manual-ocaml-4.00/manual005.ht...

Just looking at the table of contents here

http://caml.inria.fr/pub/docs/manual-ocaml/objectexamples.ht...

seems to state otherwise. That said, I think the common advice is to not use most of that and to restrict yourself to just records as they are almost always the better choice.