Not This August, also known as Christmas Eve, is a Hugo Award shortlisted science fiction novel by C.M. Kornbluth. It was originally published in 1955 by Doubleday. It was serialized in Maclean's magazine (Canada) in May and June 1955. A revised edition with a new foreword and afterword by Frederik Pohl was published in 1981 by Tor Books, ISBN 0-523-48518-2. The title comes from author Ernest Hemingway's "Notes on the Next War".