In current use

• 53-week calendar
  • ISO 8601
• Astronomical year numbering
• Bahá'í calendar
• Bengali calendar
• Buddhist calendar
• Chinese calendar
• Coptic calendar
• Discordian calendar
• Ethiopian calendar
• Fiscal year
• Germanic calendar (still in use by Ásatrúar)
• Gregorian calendar
• Hebrew calendar
• Hindu calendars
• Indian national calendar
• Indonesian calendars
• Iranian calendar
• Irish calendar
• Islamic calendar
• Revised Julian calendar
• Japanese calendar
• Julian calendar (still used by Orthodox churches for Easter)
• Malayalam calendar
• Maya calendar (parts still used by Maya Indians)
• Nanakshahi calendar
• Runic calendar (Still in use by Ásatrúar)
• Thai lunar calendar (still used for some Thai holidays)
• Thai solar calendar
• Tibetan calendar
• Zoroastrian calendar (including Parsi)

Archaic calendars

• Aztec calendar
• Attic calendar
• Babylonian calendar
• Coligny calendar
• Egyptian calendar
• French Revolutionary calendar
• Hellenic calendar
• Mesoamerican calendars
• Positivist calendar
• Roman calendar
• Runic calendar
• Soviet revolutionary calendar

Proposed

Reform calendars

• Common-Civil-Calendar-and-Time
• Holocene calendar
• International Fixed Calendar (also called the International Perpetual calendar)
• New Earth Calendar
• Pax Calendar
• Sol Calendar
• Symmetry454
• World Calendar
• The 30x11 Calendar

Non-Earth calendar proposals

• Darian calendar for use on Mars, the four Galilean moons of Jupiter, and Titan.

Fictional

• Discworld calendar
• Middle-earth calendar
• Stardates (Star Trek)
• Star Wars calendar

Specific calendars | Reference material lists

Liste der Kalendersysteme | Liste de calendriers | Listahan ng mga kalendaryo | 历法列表