John Wornham Penfold (3 December 1828 – 5 July 1909) was a surveyor and architect born in Haslemere, Surrey where he is also buried.

[1] Following his articles he worked for William Burn, before striking out to his own practice at Charlotte Row, Mansion House, London in 1854.

[1] He was a founding member of the Royal Institution of Chartered Surveyors and its Honorary Secretary from 1868 to 1904.

In the cartoon series Danger Mouse, DM's sidekick is named Penfold after J.W.

Penfold, since the duo's secret hideout was in a post box in Baker Street.