This chapter provides detail description of Internal carotid bifurcation aneurysms. Chapter has 5 well illustrated diagrams and pictures. Internal carotid bifurcation aneurysms, anatomy of internal carotid, pre-operative evaluation, intra-operative rupture, temporary clipping, giant aneurysms and complications of internal carotid bifurcation aneurysms are described in detail. 38 references are included at the end of the chapter to facilitate further reading.