The strikes will involve more than 230 Unite workers at the West Sussex airport.
Unite has announced strikes by ground handlers and passenger assistance workers at Gatwick Airport later this month in a row over pay.
The union claimed the industrial action will cause “severe disruption”.
The strikes will involve more than 230 workers.
Unite members working for ground handling company Red Handling will walk out for four days from August 18, and a further four days from August 25, which includes the August bank holiday weekend.
Members of the union employed by Wilson James, which operates Gatwick’s passenger assistance contract, will walk out for three days from August 18, and a further three days from August 22.
Unite recently called off a series of strikes by its members at the airport after reaching agreements on pay disputes.