Johann Mayer may refer to:
- Johann Tobias Mayer (1752–1830), German physicist
- Johann Mayer (serial killer) (1886–1923), German serial killer
- Johann Christoph Andreas Mayer (1747–1801), German anatomist
- Johann Friedrich Mayer (theologian) (1650–1712), German Lutheran theologian and professor of theology
- Johann Friedrich Mayer (agriculturist) (1719–1798), German Reformed pastor and agricultural reformer
- Johann Prokop Mayer (1737–1804), Austrian naturalist and botanist
See also
- Johannes Mayer (1893–1963), German general
- Johannes Meyer (disambiguation)
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