List of Famous people who died in 1921

Andrea Ferrari – later adopting the middle name "Carlo" – was an Italian Roman Catholic prelate who served as a cardinal and as the Archbishop of Milan from 1894 until his death. Ferrari was a well-regarded pastor and theologian who led two dioceses before being appointed to the prestigious Milanese archdiocese which he led until his death. But he was later accused of Modernism which led to a strained relationship with Pope Pius X who finally reconciled with Ferrari in 1912.

William Speirs Bruce was a British naturalist, polar scientist and oceanographer who organized and led the Scottish National Antarctic Expedition to the South Orkney Islands and the Weddell Sea. Among other achievements, the expedition established the first permanent weather station in Antarctica. Bruce later founded the Scottish Oceanographical Laboratory in Edinburgh, but his plans for a transcontinental Antarctic march via the South Pole were abandoned because of lack of public and financial support.

Hardinge Stanley Giffard, 1st Earl of Halsbury, PC QC later KC was a British lawyer and Conservative politician. He served three times as Lord High Chancellor of Great Britain, for a total of seventeen years.

Ōe Taku was a samurai, bureaucrat, politician, entrepreneur and social activist in the late Meiji and Taishō period Empire of Japan. He is noted as one of the more progressive figures of the early Meiji period, although his record is complex. His wife was the younger daughter of Gotō Shōjirō.

Colonel Robert George Wardlaw-Ramsay FLS, FZS was an army officer and naturalist. His father was Robert Balfour Wardlaw-Ramsay while his mother Louisa was the third daughter of George, eighth Marquess of Tweeddale. He studied at Cheam and Harrow before joining the Hampshire Regiment in January 1871 to be stationed in India, Afghanistan and Burma. His interest in birds began as a young boy and in 1872 he was elected a member of the British Ornithologists' Union and was later (1913-1918) to become its president. He was also a Fellow of the Zoological Society. During his various army postings he took a great interest in the local ornithology. He was a nephew of Arthur Hay, 9th Marquess of Tweeddale and inherited a large collection of over 20,000 bird skins that was later presented to the British Museum. He also edited The Ornithological works of Arthur 9th Marquis of Tweeddale (1881) and towards the end of his life was writing a Guide to the birds of Europe and North Africa (1923) which was published posthumously.

Olga Aleksandrovna Fedchenko or Olga Fedtschenko was a Russian botanist. Rosa fedtschenkoana, which is found in Asia, was named in her honour.