IJK or ijk may refer to: IJK (singer songwriter) (born 1981), Lebanese singer-songwriter Haplogroup IJK Indhiya Jananayaga Katchi, a political party in Tamil Nadu, India International Youth Congress () Izhevsk Airport, serving Udmurtia, Russia A convention of naming the axis of Euclidean vectors. In computer science, i, j, k; a common naming convention for the loop counter used in for loops.