St. John's Day may refer to:

Feasts celebrating the Nativity of St. John the Baptist:

• January 7, an Eastern Orthodox feast
• June 24, Midsummer Day
  • an Eastern Orthodox feast celebrating his birth
  • a Roman Catholic feast celebrating his birth
    • Fête St-Jean-Baptiste
    • Festival of San Juan
    • Saint Jonas Day
    • Jaaniõhtu
  • a Masonic feast
• August 29, an Eastern Orthodox feast commemorating his beheading
• September 23
  • an Eastern Orthodox feast celebrating his conception
  • a Roman Catholic feast celebrating his conception
• Thout 2, a Coptic Orthodox feast

Feasts celebrating John the Apostle:

• December 27, a Roman Catholic feast
• December 27, a Masonic feast
• May 8, an Eastern Orthodox feast

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