Boris Lvovich Rosing (Russian: Бори́с Льво́вич Ро́зинг) (1869–1933) was a Russian scientist and inventor in the field of television.

Born to a family of Dutch descent, Rosing first envisioned a Television system using the CRT on the receiving side in 1907. Rosing filed a patent application in Germany on November 26, 1907 and—on the improved version of his system—on March 2, 1911. He followed up with a demonstration of which a report was published in the Scientific American with diagrams and full description of the invention's operation.

Rosing's invention expanded on the designs of Paul Nipkow and his mechanical system of rotating lenses and mirrors. Accordingly, Rosing's system employed a mechanical camera device, but used very early cathode ray tube (developed in Germany by Karl Ferdinand Braun) as a receiver. The system was primitive, but it was definitely one of the first experimental demonstrations where the cathode ray tube was employed for the purposes of television.

V. K. Zworykin, who pioneered television in the United States and Germany, was a pupil of Rosing and assisted him in some of his laboratory work.

Rosing continued his television research until 1931 when he was exiled as a counter-revolutionary to Kotlas without right to work, but in 1932 was moved to Archangelsk where took up physics department of Forestry Institute. Rosing died in exile in 1933 of cerebral haemorrhage.