Christopher John Joannou (born 10 November 1979)[1] is a Macedonian-Australian musician best known as the bassist for the Newcastle-based alternative rock band Silverchair.

Joannou was nicknamed 'Lumberjack' by Silverchair fans for his love of trees, and plaid shirts.

As well as being a well known bassist, Joannou was the assistant producer for The Mess Hall albums Feeling Sideways and the ARIA award-winning Notes From A Ceiling.

He has used mainly G&L and Fender Precision Basses, and almost exclusively uses Ampeg B-15 Portaflex combos.

In 2006, Joannou spoke at the launch of a mental health scholarship set up to honour his cousin, Nathan Trepezanov, who died by suicide at the age of 21 in January of that year.