Magnús Magnússon KBE (October 12, 1929 - January 7, 2007) was a television presenter, journalist, translator and writer. He was born in Iceland but lived in Scotland for nearly all of his life, although he never took British citizenship. He came to fame as presenter of the BBC television quiz programme Mastermind, which he hosted for 25 years.

Magnússon was awarded an honorary knighthood (Knight Commander of the Order of the British Empire) in 1989, and was elected President of the Royal Society for the Protection of Birds for a five-year period, at their 94th AGM in October 1995, succeeding Max Nicholson. He also became the founder Chairman of Scottish Natural Heritage upon its inception in 1992.

In 2002 he became Chancellor of Glasgow Caledonian University.

In the early years of the 21st century, Magnússon also wrote for the New Statesman.

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