Sir Archibald Richard James Southby, 1st Baronet was an English Royal Navy officer and Conservative Party politician.

Epsom was a borough constituency represented in the House of Commons of the Parliament of the United Kingdom. It elected one Member of Parliament (MP) by the first past the post system of election. From its creation in 1885 until its abolition in 1974, it was won by eight Conservatives. The winner took less than 50% of the votes in its contested elections once, in 1945, receiving 49.9% of the vote in a three-party contest. Six elections, the last being a by-election in 1912, were uncontested.