Trnová may refer to:

• Trnová (Plzeň-North District), a village in the Czech Republic
• Trnová (Prague-West District), a village in the Czech Republic

• Valea Măriii River
• Valea Mărului River (Cenușa)
• Valea Mărului River (Olt)
• Valea Mărului River (Prahova)
• Valea Mărului River (Rusca)
• Valea Mărului River (Someș)
• Valea Mărăcinilor River
• Valea Măturarului River
• Valea Neagra
• Valea Neagră
• Valea Neagră, Maramureş
• Valea Neagră River (Brătei)
• Valea Neagră River (Clăbuceasa)
• Valea Neagră River (Crișul Negru)
• Valea Neagră River (Crișul Repede)
• Valea Neagră River (Doftana)
• Valea Neagră River (Firiza)
• Valea Neagră River (Gepiu)
• Valea Neagră River (Ghimbășel)
• Valea Neagră River (Lotrioara)
• Valea Neagră River (Negrișoara)
• Valea Neagră River (Năruja)
• Valea Neagră River (Olt)
• Valea Neagră River (Olănești)
• Valea Neagră River (Repedea)