UJ may refer to: Universities: University of Jaffna, in Sri Lanka Jagiellonian University of Kraków, Poland University of Jamestown, in Jamestown, North Dakota, US University of Johannesburg, South Africa University of Jordan, the oldest institution of higher learning in Jordan University of Judaism, former name of the American Jewish University Other uses: Awj, a Syrian village near Hama, sometimes spelled Uj Microjoule (μJ), a unit of energy equal to one millionth of one joule , a Hungarian-language Zionist Jewish Newspaper UJ Seuteni, a rugby union footballer Union Jack or Union Flag, the national flag of the United Kingdom Universal joint, a mechanical coupling