Looking for guidance on whether BSA/AML training is required for contractors at a financial institution. Is it required for all, dependent on job function or not required at all?

What type of contractors are you referring to?

They could be consultants hired to do work for IT, Marketing, Credit Underwriting, Compliance etc.

I don't believe that you are expected to train non-bank employees.

If they are function in any capacity that exposes them to AML risks by performing line or management tasks - you bet they need it. I know banks in which "all" of the employees are contract labor. It would be no different than hiring a temp. from a temp agency for the teller line. If you are talking about auditors and such, no.