Field day may refer to:
For the armed forces use and its derivatives, see wiktionary:field day
Field day (agriculture), a trade show
Field Day (amateur radio), an annual amateur radio exercise
Field Day (band), a Canadian pop-punk band from Calgary, Alberta
Field Day (festival), a music festival in London
Field Day (Sydney festival), an outdoor music festival held every year on New Years Day in Sydney
Field Day Theatre Company, Irish theatre and publishing company
Field Day (Dag Nasty album)
Field Day (Marshall Crenshaw album)
Field Day (Anthony Phillips album)
Sports day, a competitive event held by schools
Club Day, an English community celebration
"Field Day", a 1991 episode of the PBS show Shining Time Station