She "passed away peacefully at her London home in the early hours of this morning", reported BBC citing a statement from her publisher, Harper Collins.
Her best-known works include The Golden Notebook, Memoirs of a Survivor and The Summer Before the Dark.
Lessing became the oldest winner of the Nobel Prize for Literature when in 2007 she won the award for her life's work aged 88.
She was "a wonderful writer with a fascinating and original mind", said Jonathan Clowes, her long-time friend and agent.
Some of her other novels focused on her African experiences and social and political struggle, while others were thrillers and science fiction, Xinhua reported.
The Swedish Academy described her as an "epicist of the female experience, who with skepticism, fire and visionary power has subjected a divided civilisation to scrutiny."