The Office of the Privacy Commissioner for Personal Data has arrested a woman on suspicion of disclosing another woman's personal information online.

The office on Tuesday said the pair were both online traders who had had a business relationship which later turned sour.

The alleged victim made a complaint after personal information on her and her husband, including their names and phone numbers, were posted on social media groups last December, along with allegations of fraud.

The privacy watchdog said the woman arrested has been granted bail and a probe is ongoing.