Verrill Rapp, also Verrill Raap (c.1906-?) was an American criminal who was a convicted post office robber. A 1930 census mentioned him living in Fresno, California and being 24 years old at the time. He is best known for being the earliest prisoner to be transferred from Alcatraz Federal Penitentiary in the spring of 1935. Upon leaving to stand trial on other charges, Rapp reported that Alcatraz was a place of "inhumane treatment" and that it was causing many inmates to go insane. This was widely reported in the press and marked the beginning of its sinister reputation.
- "Alcatraz Prisoners Numbers 1 to 50". Notfrisco. Retrieved 7 September 2012.
- Odier, Pierre (1 January 1982). The Rock: a history of Alcatraz : the fort/the prison. L'Image Odier. p. 117. ISBN 978-0-9611632-0-4. Retrieved 7 September 2012.
- Oliver, Marilyn Tower (August 1998). Alcatraz Prison in American history. Enslow Publishers. p. 72. ISBN 978-0-89490-990-0. Retrieved 7 September 2012.