They say the charges stem from an incident in September of last year when a female client went to the man's office on King St. W.
Police allege the woman was sexually assaulted during that visit.
They arrested 60-year-old Dinesh Khanna of Oakville last month and charged him with one count.
Police say they believe there may be other victims and are encouraging anyone with information to come forward.
Hamilton police say they've charged a local mortgage broker with sexual assault.