OGG or ogg may refer to:

• Ogg (Cro character), in the Children's Television Workshop animated television show
• Operation Good Guys (OGG), a British TV mockumentary series
• Nanny Ogg, a character in the Discworld series of books
• Ogging, an online computer gaming tactic popularized by the network game Netrek

• Original Gospel Gangstaz, Christian hip hop group
• Oxford Geology Group, a British geological society

• Ogg, Texas
• Kahului Airport's IATA code

• Ogg, a multimedia container file format, in computing
• Ogg Vorbis, the Vorbis free software/open source audio codec, commonly used with the Ogg container
• Oxoguanine glycosylase, a DNA glycosylase enzyme

• Ogg (surname)
• Oud Gereformeerde Gemeenten, a pietistic Reformed denomination in the Netherlands

• Oggy (disambiguation)