The Skelton Transmitting Station is a radio transmitter site at near Skelton, Cumbria, England, about north-west of Penrith. It is operated by Babcock International and owned by the Ministry of Defence. Shortwave broadcasts from the station ended on 30 March 2023, with services transferred to Woofferton. At , Skelton's lattice mast is the tallest structure in the United Kingdom.
The site was built by J. L. Eve Construction during the Second World War, for long-distance short-wave transmissions, across Europe.
In 1946 the BBC described the site as "the World's largest and most powerful (shortwave) radio station".
Its primary function was shortwave broadcasting. The station was capable of Digital Radio Mondiale (DRM) transmission on at least 3955 kHz and 3975 kHz (75m broadcast band), beamed at 121ð towards Germany and Central Europe. Known AM frequencies included 5995 kHz and 6195 kHz (49-metre band), 9410 kHz (31-metre band), and 12095 kHz (25-metre band).
A Royal Navy very low frequency (VLF) transmitter is also located on the site. It is used to transmit encrypted orders to submarines, including the Trident SLBM fleet. Its aerial is a guyed steel lattice mast, insulated from the ground and the tallest structure in the United Kingdom. The transmitter entered service in 2001.