Catherine Johnson is an English author and screenwriter. She has written several young adult novels and co-wrote the screenplay for the 2004 drama film Bullet Boy.

Johnson was born in London, England, in 1962. Her father was Jamaican and her mother was Welsh. Johnson grew up in North London and attended Tetherdown Primary School. Later, she studied film at St Martin's School of Art before turning to writing.

Her first book, The Last Welsh Summer, was published by Welsh publisher Pont Books in 1993. She has since written and published 20 novels. In 1999, her book Landlocked was honoured as an International Youth Library White Raven book. Other accolades include the 2014 Young Quills Award for best historical fiction for over-12s for her 2013 book.