Series consists of notes produced by Dr. Penfield on books and articles he had read.

This series contains typed drafts and published sermons both written and delivered by Dr. Penfield, as well as published sermons by various Presbyterian/United Church ministers.

This series consists of correspondence, notes, reports, and report drafts which were created and collected by Dr. Penfield as part of his travels to, and work in, Britain, the Middle East, and the Soviet Union for the National Research Council of Canada during the Second World War. (TR = Travels)

This series contains the final drafts of Dr. Penfield's various published books.

Series consists of newspaper and magazine article clippings collected by Dr. Penfield.

Series consists of reports and notes collected and produced by Dr. Penfield as part of his work on committees of the National Research Council of Canada during the Second World War. The documents found in the series include American, British, and Canadian reports on different kinds of medical tests, as well as committee meeting minutes. (WP-CTEE = Wilder Penfield - Committees)

This series contains correspondence between Dr. Penfield and friends and colleagues, as well as social and professional institutions. The series' contents were found at the Montreal Neurological Institute in 2008, and thus, were not included with original correspondence series (Series C) of the Penfield Archive. The records in this series have been catalogued at the item level.

This series contains a group of calendars, or diaries, kept by Dr. Penfield's wife between 1947 and 1974.

Series consists of a drawer of catalogue cards with information concerning most MNI Fellows from between the institute's opening to the 1970s. Much of this information consists of mailing addresses which were compiled in the late 1970s and early 1980s, and is thus likely no longer accurate. Many of the cards are also accompanied by photographs of the particular Fellow.

This series contains correspondence between Helen Kermott Penfield and Wilder Graves Penfield, as well as other friends and family between 1920 and 1932.