George Holbrook Jackson (31 December 1874 – 16 June 1948) was a British journalist, writer and publisher. He was recognised as one of the leading bibliophiles of his time.
Holbrook Jackson was born in Liverpool, England. He worked as a clerk, while freelancing as a writer. Around 1900 he was in the lace trade in Leeds, where he met A. R. Orage; together they founded the Leeds Arts Club. At that time Jackson was a Fabian socialist, but also influenced by Nietzsche. It was Jackson who introduced Orage to Nietzsche, lending him a copy of Thus Spoke Zarathustra in 1900.
Later they separately moved to London as journalists. In 1906, shortly after arriving in the capital, Jackson suggested founding a similar group to the Leeds Arts Club, the Fabian Arts Group. This eventually led to a split from the Fabian Society, whose interest was economic and political. In 1907, Jackson and Orage bought The New Age, a struggling Christian Socialist weekly magazine, with finance from Lewis Wallace and George Bernard Shaw.