K3 (Catalan pronunciation: [ˈka ˈtɾɛs]) was a Catalan public television channel operated by Televisió de Catalunya available in analogue and DTT in Catalonia, Balearic Islands, Valencia, Andorra, Northern Catalonia and partly in Aragon.

33 got the old frequency on its own, while K3 shared its multiplex slot with the 300 channel.

K3 was a children/teenagers channel, that usually broadcasts from morning to 21:30 on weekdays and a couple of hours around midday on the weekend.

It broadcast both entertainment and educational programs, with a wide range of ages.

Early morning were usually dedicated to younger children, while the afternoon is more devoted to teenagers.