Marcus Andrew Sinden is an English actor and film & theatre director and producer.

The Mermaid Theatre was a theatre encompassing the site of Puddle Dock and Curriers' Alley at Blackfriars in the City of London, and the first built in the City since the time of Shakespeare. It was, importantly, also one of the first new theatres to abandon the traditional stage layout; instead of this, a single tier of seats surrounded the stage on three sides.