Keio (慶応 Keiō) was a Japanese era name. Keio University was named after this era name.

Start: May 1, 1865 (7th day of the 5th month)
End: October 22, 1868 (7th day of the 9th month)

Keio1st2nd3rd4th
Gregorian1862186318641865

Preceded by:
Genji 		Japanese era name Succeeded by:
Meiji