Fro may refer to:

• "Fro", slang for Afro, a hairstyle in the form of a big puff
• fro, the ISO 639 code for the language Old French
• José Roel Lungay, a priest widely known as Fro (for Father Roel)
• Fro, as in the phrase "to and fro" referring to back and forth
• FRO Swedish Voluntary Radio organisation. Part of the Swedish civil defence.

FRO can refer to

• a file format which is used by the SQL database on the Network Element
• Fixed return option, American Stock Exchange's name for binary option
• Faroe Islands
• Frontline Ltd's New York Stock Exchange
• Florø Airport's IATA airport code
• Family responsibility office, in Ontario, Canada
• Forest range officer, an officer in the State Forest Services of the Government of India
• For Rednecks Only] the first enduro mountain biking sports team in Hungary
• "For Record Only", used in caving surveys for recording the existence of a cave without thoroughly describing it

Freyr or Frey is one of the most important gods of Norse religion. The name is conjectured to derive from the Proto-Norse *frawjaz, "lord". Freyr was associated with sacral kingship, virility and prosperity, with sunshine and fair weather, as well as was pictured as a phallic fertility god, Freyr "bestows peace and pleasure on mortals". Freyr, sometimes referred to as Yngvi-Freyr, was especially associated with Sweden and seen as an ancestor of the Swedish royal house.