The 1,400 workers – who are based at Heathrow’s Terminal 5 and in campus security – will be striking on 4, 5, 6, 9 and 10 May and then again on 25, 26, 27 May.
The move comes after new Unite research claimed security officers at the London airport are paid £6,000 per year less than their counterparts at other local airports.
Unite general secretary Sharon Graham said: "Heathrow prides itself on being the UK’s premium airport – it is bigger and handles more flights and cargo than any other.