The Thals are a fictional race of humanoid aliens from the British science fiction television series Doctor Who, originating on the planet Skaro.

According to Thal oral history, they were once a warlike race, but following a terrible war with the peaceful and scientific Dals who shared their planet, they renounced violence and became pacifist farmers. After centuries of this lifestyle, they were forced to take up arms again when the Dals - now developed into the aggressive and xenophobic Daleks - returned and attempted to wipe them out.

That history was retconned in the 1974 serial, Genesis of the Daleks, which revealed the detailed origin of the Daleks. The name of the Dals was changed to the Kaleds, who were involved in a generations-long war of attrition with the Thals. The prolonged conflict had turned Skaro into a wasteland, and radiation sickness was a common hazard. The Kaled chief scientist, Davros, accelerated the mutation of the Kaled species and put the results into tank-like travel machines, which became the dreaded Daleks.

In the 1973 serial, Planet of the Daleks, a Thal expedition is sent to the planet Spiridon. Together, the Thals and the Doctor defeat a Dalek plan to duplicate the natural invisibility of the planet's inhabitants.