Johannes Salat (also Hans Salat, Hans Seiler, born 1498 in Sursee, died before 23 October 1561) was a Swiss chronicler, dramatist and mercenary. Much of his life is documented in his diary entries, covering the years 1517 to 1550. A rope-maker by education, he may also have attended the Latin college in Sursee. He lived in Zürich during 1511 to 1519, and again in Sursee during 1519/20 before moving to Lucerne, where he lived during the 1520s and 1530s, during 1522 to 1527 intermittently participating in several military campaigns in French service in the Italian Wars as quartermaster, and in the Musso war in the service of Lucerne. He was also present in the Wars of Kappel against Protestant Zürich in 1529 and 1531.