STO may refer to:

• Council of Labor and Defense, a Soviet central planning agency of the 1920s
• Seoul Tourism Organization, a company commissioned to promote tourism in Seoul
• Service du travail obligatoire, a forced labour programme introduced by the Vichy French government during World War II
• SIM Thioguanine/Ouabain-resistant mouse fibroblast cell line, where SIM refers to Sandos Inbred Mice
• Slater-type orbital, a function used to describe atomic orbitals in quantum chemistry
• Société de transport de l'Outaouais, a public transit operator in Gatineau, Quebec, Canada
• Sojourner Truth Organization, a defunct American leftist group
• Soldiers of the One, a monotheistic religious group in Syfy's Caprica
• Space Tornado Ogawa, a professional wrestling throw
• SportsTime Ohio, a regional sports network in northeast Ohio, United States
• Star Trek Online, a massively multiplayer online role-playing game
• State Trading Organization, a publicly owned Maldivian company
• Statoil, a publicly traded Norwegian oil company
• STO-nG basis sets, the minimal basis sets in numeric quantic chemistry
• Stockholm-All Airports, IATA airport code for Stockholm, Sweden including Arlanda Airport (ARN), Skavsta Airport (NYO), Bromma Airport (BMA), Västerås Airport (VST)
• Stoney language (ISO 639-3 code)
• Strontium titanate (SrTiO₃)

Stø is a fishing village located on the northern tip of the island of Langøya, along the Gavlfjorden in the Vesterålen archipelago. It is part of the municipality of Øksnes in Nordland county, Norway. In 2001, there were about 175 residents. This village was the administrative centre of the old municipality of Langenes.

STO may refer to:

• Council of Labor and Defense, a Soviet central planning agency of the 1920s
• Seoul Tourism Organization, a company commissioned to promote tourism in Seoul
• Service du travail obligatoire, a forced labour programme introduced by the Vichy French government during World War II
• SIM Thioguanine/Ouabain-resistant mouse fibroblast cell line, where SIM refers to Sandos Inbred Mice
• Slater-type orbital, a function used to describe atomic orbitals in quantum chemistry
• Société de transport de l'Outaouais, a public transit operator in Gatineau, Quebec, Canada
• Sojourner Truth Organization, a defunct American leftist group
• Soldiers of the One, a monotheistic religious group in Syfy's Caprica
• Space Tornado Ogawa, a professional wrestling throw
• SportsTime Ohio, a regional sports network in northeast Ohio, United States
• Star Trek Online, a massively multiplayer online role-playing game
• State Trading Organization, a publicly owned Maldivian company
• Statoil, a publicly traded Norwegian oil company
• STO-nG basis sets, the minimal basis sets in numeric quantic chemistry
• Stockholm-All Airports, IATA airport code for Stockholm, Sweden including Arlanda Airport (ARN), Skavsta Airport (NYO), Bromma Airport (BMA), Västerås Airport (VST)
• Stoney language (ISO 639-3 code)
• Strontium titanate (SrTiO₃)

Stø is a fishing village located on the northern tip of the island of Langøya, along the Gavlfjorden in the Vesterålen archipelago. It is part of the municipality of Øksnes in Nordland county, Norway. In 2001, there were about 175 residents. This village was the administrative centre of the old municipality of Langenes.