Tosna (vene Тосна, soome Tusinajoki, Tuusnanjoki) on jõgi Euroopas Venemaa Leningradi oblastis.
Voolab valdavalt põhja, suubub vasakult Neevasse. Pikkus 127 km.
Jõe lähedal asub Krasnõi Bori asula.
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