Steve Ignorant (born Steve Williams in 1957) is a singer and artist. He co-founded the anarcho-punk band Crass with Penny Rimbaud in 1977. After Crass stopped performing in 1984, he has worked with other groups including Conflict, Schwartzeneggar, The Stratford Mercenaries, Current 93 (under the name Stephen Intelligent), US punk band Thought Crime, as well as being an occasional solo performer.
He is also a sculptor, and has worked as a traditional Punch and Judy performer using the name Professor Ignorant. In recent years he has developed an interest in the history of traditional east London music hall performance.