Ova or OVA may refer to:

• Ovum, plural ova, the female sex cell or gamete
• Ova, the eggs of helminths, a worm-like organism that can cause infections in humans and animals
• Ovalbumin (OVA), a protein found in egg whites
• Ova, Kas, a village in the Antalya Province, Turkey
• Ova, Kentucky, an unincorporated community in the United States
• Ova A. Kelley (1914–1944), United States Army soldier and Medal of Honor recipient
• OpenVera Assertion Language, a hardware verification Language
• Original video animation, anime that are released directly to video
• Ostrava, city in the Czech Republic
• -ova, a feminine surname suffix in Slavic-language countries; see Eastern Slavic naming customs
• Open Virtualization Archive, the single-file version of an Open Virtualization Format image
• Open Virtualization Alliance consortium committed to fostering the adoption of open virtualization technologies

Open Virtualization Format (OVF) is an open standard for packaging and distributing virtual appliances or, more generally, software to be run in virtual machines.

, abbreviated as media (and sometimes as OAV, original animated video), are animated films and series made specially for release in home video formats without prior showings on television or in theatres, though the first part of an OVA series may be broadcast for promotional purposes. OVA titles were originally made available on VHS, later becoming more popular on LaserDisc and eventually DVD. Starting in 2008, the term OAD (original animation DVD) began to refer to DVD releases published bundled with their source-material manga.