Alexander Henry Fenwick Armstrong (born 2 March 1970) is an English actor and presenter, currently employed as the host of Pointless alongside sidekick Richard Osman. Armstrong has performed in sketch show  Armstrong and Miller as well as Dr Who.

A keen musician and classically trained singer, Armstrong has released two albums, the first of which reached number one in the UK classical charts. He is also a piano player.

He is married to Hannah Snow, and through his wife has ended up the brother-in-law of food writer Giles Coren.