Richard Knight Causton, 1st Baron Southwark PC, DL (25 September 1843 – 23 February 1929) was an English stationer and Liberal politician who sat in the House of Commons in two periods between 1880 and 1910.

[4] He served under William Ewart Gladstone and the Earl of Rosebery as a Junior Lord of the Treasury between 1892 and 1895 and continued as Liberal Whip until 1905.

[citation needed] When the Liberals returned to power in December 1905 under Sir Henry Campbell-Bannerman, Causton was made Paymaster General.

[citation needed] Lord Southwark died in February 1929, aged 85, his estate probated in the London Registry at £21282 12s 2d (equivalent to £1,634,000 in 2023).

[8] In 1913 she published her book Social and Political Reminiscences, in which she relates her part in electioneering and reproduces her pencil sketches of their acquaintance in London society.