Edwin Otho Sachs FRSE FRGS (5 April 1870 – 9 September 1919) was a British architect and engineer of German descent, who, by his interest in theatre and working as a stagehand and fireman, specialized in the prevention of theatre fires.

Today he is probably most known as co-author of the three-volume book set Modern Opera Houses and Theatres.

[4] In 1898 he installed electric lifts in the Theatre Royal, Drury Lane.

His proposers were Thomas Ernest Gatehouse, Boverton Redwood, Sir William Thomson, Lord Kelvin and Andrew Gray.

Edwin Sachs (co-)authored the following works: Contributions to publications of the British Fire Prevention Committee: Sachs also contributed to the 1911 edition of the Encyclopædia Britannica, notably the section "Modern Stage Mechanism" in the article "Theatre".