Simon Sydenham (died 1438) was a medieval Dean of Salisbury and Bishop of Chichester.

Sydenham was briefly Archdeacon of Berkshire in 1404, then Archdeacon of Salisbury from 1404 to 1418 and Dean of Salisbury from 1418 to 1431.

Between 1417 and 1421 he was rector of Sutton Veny, Wiltshire.

[1] Sydenham was nominated to the office of Bishop of Chichester on 14 October 1429 and consecrated on 11 February 1431.

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