The Klyazma (, Klyaz'ma or Kliazma), a river in the Moscow, Nizhny Novgorod, Ivanovo and Vladimir Oblasts in Russia, and a left tributary of the Oka.
The long river's drainage basin is .
- Ucha (left)
- Vorya (left)
- Sherna (left)
- Kirzhach (left)
- Peksha (left)
- Polya (right)
- Koloksha (left)
- Nerl (left)
- Sudogda (right)
- Nerekhta (right)
- Uvod (left)
- Teza (left)
- Lukh (left)
- Suvoroshch (right)
The Klyazma is navigable within from its estuary and in the area of the Klyazminskoye Reservoir. The cities of Gorokhovets, Mendeleyevo, Pavlovsky Posad, Vladimir, Kovrov, Shchyolkovo, Losino-Petrovsky, Noginsk, Orekhovo-Zuyevo, Sobinka and Vyazniki stand on the shores of the Klyazma River.
The basin of the Klyazma formed the center of the Vladimir-Suzdal principality in the 12th to 14th centuries CE.