Richard Lassels (also Lascelles) (c. 1603–1668) was a Roman Catholic priest and a travel writer. Lassels was a tutor to several of the English nobility, and traveled through Italy five times. He is best known for his work, Voyage or a Complete Journey through Italy, published in Paris in 1670. In his book, he asserts that any truly serious student of architecture, antiquity, and the arts must travel through France and Italy, and suggested that all "young lords" make what he referred to as the Grand Tour in order to understand the political, social, and economic realities of the world.
- Chaney, Edward (1985). The Grand Tour and the Great Rebellion: Richard Lassels and 'The Voyage of Italy' in the Seventeenth Century. Biblioteca del viaggio in Italia. Genève: Slatkine. OCLC 14099762.
- Chaney, Edward (2004). "Lassels , Richard (c.1603–1668)". Oxford Dictionary of National Biography. Oxford University Press. doi:10.1093/ref:odnb/16083. Retrieved 2009-10-29. (subscription or UK public library membership required)