Retzius may refer to:
- A Swedish family, which counts among its members prominent scientists:
- Anders Jahan Retzius (1742-1821), naturalist
- Anders Retzius (1796-1860), anatomist; son of Anders Jahan Retzius
- Carl Gustaf Retzius (1798-1833), botanist; son of Anders Jahan Retzius
- Gustaf Retzius (1842-1919), anatomist, liberal publicist; son of Anders Retzius
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