Sir Roderick Sinclair Meiklejohn, KBE, CB (30 May 1876 – 18 January 1962) was an English civil servant.
Educated at Hertford College, Oxford, he entered the civil service in 1899; initially serving in the War Office, from 1902 he was in HM Treasury.
From 1928 to 1939, he was First Civil Service Commissioner.
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