The shootout took place in the province's Okara city, about 120 kms from here.
District Police Officer (DPO) Faisal Rana said that police raided the area following a tip-off that six suspected militants were hiding in the area, Radio Pakistan reported.
An encounter occurred when police officials reached the spot. Six militants were killed and two security personnel injured in the exchange of fire, Rana added.
Police claimed to have recovered a cache of explosives and detonators along with a map of the DPO's office from the militants' hideout.