OJN is an abbreviation for Order of Julian of Norwich, a contemplative community of monks and nuns in the Episcopal Church.
OJN may also refer to:
- OJN (musician), a musician signed on to Loca Records
- OJN (song), a 1984 song by Hal Russell off the album Conserving NRG
- Orkhon Jims Nogoo (stock ticker: OJN), a foodstuffs company listed on the Mongolian Stock Exchange, see List of companies listed on the Mongolian Stock Exchange