Klaus Ernst (definition of terms)
Klaus Ernst is the name of the following people:
- Klaus Ernst (* 1954), German trade union official and politician (Die Linke)
- Klaus Ernst (doctor, 1924) (1924–2010), Swiss psychiatrist and university professor
- Klaus Ernst (medic, 1936) (* 1936), German psychiatrist and university professor
- Klaus Ernst (sociologist) (* 1936), German sociologist, university professor and diplomat