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- Gustav Radbruch (1878–1949) (Routledge 2000)
- Paul Rée (1849–1901) (Oxford 1995)
- Hans Reichenbach (1891–1953) (Cambridge; Macmillan; Routledge 2000)
- Hermann Samuel Reimarus (1694–1768) (Cambridge; Macmillan)
- Adolf Reinach (1883–1917) (Routledge 2000)
- Karl Leonhard Reinhold (1758–1823) (Cambridge; Macmillan)
- Alois Riehl (1844–1924) (Macmillan)
- Karl Rosenkranz (1805–1879) (Macmillan)
- Franz Rosenzweig (1886–1929) (Cambridge; Metzler; Oxford 1995)
Read more about this topic: List Of German Language Philosophers