Johann IV von Habsburg-Laufenburg (en), Johann IV. von Habsburg-Laufenburg (de), Johann IV von Habsburg-Laufenburg (fr), Johann IV von Habsburg-Laufenburg (it), Johann IV von Habsburg-Laufenburg (es)
John IV of Habsburg-Laufenburg (born around 1360, presumably in Laufenburg; died 18 May 1408) was the last count of the House
of Habsburg-Laufenburg, landgrave in Klettgau, lord of Laufenburg and bailiff of Rheinau Abbey, lord of Krenkingen until 1398,
and from 1392 also of Rotenberg. In the service of Austria, Johann IV was bailiff in Thurgau, Aargau and the Black Forest.