JII

JII may refer to:
 * -ji, an honorific suffix in Hindustani and other Indian languages
 * Jakarta Islamic Index
 * Jiiddu language
 * John Innes Institute
 * JPMorgan Indian Investment Trust
 * Sinopterus jii, an extinct species of pterosaur
 * Sinocyclocheilus jii, a species of ray-finned fish
 * Albatros J.II, a World War I German biplane