The Trespasser is the second novel written by D. H. Lawrence, published in 1912. Originally it was entitled the Saga of Siegmund and drew upon the experiences of a friend of Lawrence, Helen Corke, and her adulterous relationship with a married man that ended with his suicide. Lawrence worked from Corke's diary, with her permission, but also urged her to publish; which she did in 1933 as Neutral Ground.

David Herbert Lawrence (1885-1930) was an English novelist, poet, playwright, essayist, literary critic and painter who published as D. H. Lawrence. Lawrence is perhaps best known for his novels Sons and Lovers, The Rainbow, Women in Love and Lady Chatterley's Lover.