The 26-year-old had been out of contract since the middle of January, having originally joined the club in mid-November.
The former Middlesbrough man played eight times under previous manager Derek McInnes and, after the Scot's departure, new head coach Sean O'Driscoll had to wait a couple of weeks to assess Bates fully due to an illness picked up by the centre-back.
City have also announced that development players Kevin Krans and Luke Dobie have signed new 18-month contracts.
The duo, who joined in the summer, have both have impressed academy coaching staff suitably to earn extended terms at Ashton Gate.
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