The Electric Telegraph Company (ETC) was a British telegraph company founded in 1846 by William Fothergill Cooke and John Ricardo. It was the world's first public telegraph company. The equipment used was the Cooke and Wheatstone telegraph, an electrical telegraph developed a few years earlier in collaboration with Charles Wheatstone. The system had been taken up by several railway companies for signalling purposes, but in forming the company Cooke intended to open up the technology to the public at large.

The ETC had a monopoly of electrical telegraphy until the formation of the Magnetic Telegraph Company (commonly called the Magnetic) who used a different system which did not infringe the ETC's patents. The Magnetic became the chief rival of the ETC and the two of them dominated the market even after further companies entered the field.

The ETC was heavily involved in laying submarine telegraph cables, including lines to the Netherlands, Ireland, the Channel Islands, and the Isle of Man. It operated the world's first specialised cable-laying ship, the Monarch. A private line was laid for Queen Victoria on the Isle of Wight. The company was nationalised in 1870 along with other British telegraph companies, and its assets were taken over by the General Post Office.