Cajal:
Santiago Ramón y Cajal, Spanish histologist, physician, pathologist
Fortún Garcés Cajal, medieval Spanish nobleman
Nicolae Cajal (1919–2004), Romanian Jewish physician, academic, politician, philanthropist
Cajal Institute, a neuroscience research center in Madrid, Spain.
Cajal cells
Cajal–Retzius cell
Interstitial cell of Cajal (ICC)
Cajal bodies (CBs)
Cajal (crater), a tiny lunar impact crater
