Hornøya may refer to:

• Hornøya (Finnmark), an island off the coast of mainline Norway; the easternmost point of Norway
• Hornøya (Svalbard), one of a group of small islands south of the island of Edgeøya, Norway

• Lasker-Noether primary decomposition
• Lasker's Trap
• Lasker (surname)
• Lasker – Bauer, Amsterdam, 1889
• Lasker–Noether theorem
• Laskey
• Laskeya
• Las Khorey district
• Las Khorey Port
• Laskhuiyeh
• Laskhu'iyeh
• Laski Kazimierz
• Laskin nozzle
• Laski (surname)
• Lasko - Die Faust Gottes
• Laskooh
• Las Korey District
• Lasko, Slovenia
• Lasko subdialect
• Laskoviy Mai
• Laskoviy Mai (film)
• Laskovyy May
• Laskowka, Podkarpackie Voivodeship
• Lasko – Die Faust Gottes
• Lask, Poland