The Computer History Museum Prize is awarded to the author of an outstanding book in the history of computing broadly conceived, published during the prior three years. The prize of $1,000 is awarded by SIGCIS, the Special Interest Group for Computers, Information and Society. SIGCIS is part of the Society for the History of Technology. In 2012 the prize was endowed in perpetuity through a generous bequest from the estate of Paul Baran, a legendary computer innovator and entrepreneur best known for his work to develop and promote the packet switching approach on which modern networks are built. Baran was a longtime supporter of work on the history of information technology and named the prize to celebrate the contributions of the Computer History Museum to that field. *2019 Call for Submission* Books published in 2016-2018 are eligible for the 2019 award. Books in translation are eligible for three years following the date of their publication in English. Publishers, authors, and other interested members of the computer history community are invited to nominate books. Please note that books nominated in previous years may be nominated again, provided they have been published in the timeframes specified above. Send one copy of the nominated title to each of the committee members listed below, with a postmark no later than *April 30, 2019.* For more information, please contact the Committee Chair, Prof. Rebecca Slayton. Current information about the prize, including the most recent call and a list of previous winners, always may be found at http://www.sigcis.org/chmprize.