Ay Petri yayla (Crimean Tatar: Ay Petri yaylası; Ukrainian: Ай-Пе́тринська яйла́, romanized: Ai-Petrynska yaila; Russian: Ай-Петринская яйла, romanized: Ay-Petrinskaya yayla) is a massif and regional nature reserve (zakaznik) located in Crimea, a region internationally recognised as part of Ukraine but occupied by Russia since 2014.

Ay Petri yayla is home to a variety of tunnels with a combined length of 1,800 m (5,900 ft), as well as numerous caves.

[1] Ay Petri yayla is recognised as a regional landscape reserve (zakaznik) of Crimea, including an area of 1,795.5 ha (17.955 km2).

[3] Environmental concerns regarding Ay Petri yayla have been particularly significant, with Anatoliy Hrytsenko calling on President Viktor Yushchenko to expand environmental protections to clear pollution on the mountain in 2007.

[4] In 2014, environmental activists protested plans by the government of Anatolii Mohyliov to expand recreational areas on the yayla, as well as for the removal of areas on the Southern Coast from the Yalta Mountain-Forest Nature Reserve.