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