Martin Secker was a publishing house which operated in London between 1910 and 1935, and became one of the most important literary publishers of the twentieth century. The firm was best known for its publication of literary fiction, literary criticism, translations of foreign literature, and reprints of literary classics. The founder, Martin Secker, is credited with taking the risk of publishing the work of a number of new writers, including Compton Mackenzie, whom he discovered. The firm published the novels of D. H. Lawrence from 1920, including his Australian work, Kangaroo, and The Boy in the Bush.
The firm went into liquidation in 1935, and was purchased by Frederick Warburg, who formed Secker and Warburg.