Julian Day

Julian Day may refer to:


 * Julian day, a continuous sequential count of days since day 0 at the beginning of the Julian Period on Monday, January 1, 4713 BC, proleptic Julian calendar
 * Julian C. Day (born 1952), American corporate executive
 * Julian R. Day, author, computer project manager and charity fundraiser
 * Calendar Man, a DC Comics supervillain, whose real name is Julian Gregory Day
 * Julian Day (artist), broadcaster, artist and composer