Ilyinsky (masculine), Ilyinskaya (feminine), or Ilyinskoye (neuter) may refer to:
- Ilyinsky (surname) (Ilyinskaya)
Ilyinsky (, Ilyinskaya sopka) is a stratovolcano located in the southern part of Kamchatka Peninsula, Russia near Kurile Lake.
Ilyinsky (; masculine), Ilyinskaya (; feminine), or Ilyinskoye (; neuter) is the name of several inhabited localities in Russia.
Ilyinsky is a surname. Notable people with the surname include:
- Alexander Ilyinsky (1859-1919), Russian composer
- Igor Ilyinsky (1901–1987), Soviet actor
- Paul Ilyinsky (1928–2004), three-time Mayor of Palm Beach, Florida, the United States