The Mask of Apollo is a historical novel written by Mary Renault. Set in the ancient Greek world during the 4th century BC, the novel is written as the first-person narrative of a fictional character, Nikeratos (or 'Niko'), an actor. Throughout his professional life and his work in Syracuse and Athens, Nikeratos meets several historical characters and becomes a witness (and sometimes a marginal participant) in the political conflicts of Syracuse.