SK may refer to:
People SK (actor) or Sivakarthikeyan, Indian actor Salman Khan or SK, Indian actor Shahram Kashani (SK), an Iranian-American singer Shakib Khan, Bangladeshi film actor, known by the initialism SK Søren Kierkegaard, Danish philosopher and theologian
Businesses and organizations SK Foods, an American agribusiness company SK Hand Tools, an American tool manufacturer Sangguniang Kabataan, Philippines youth councils SK Group, South Korean conglomerate Scandinavian Airlines (IATA code SK) Silicon Knights, a Canadian video game developer
Places Slovakia Slovakia (ISO country code) ISO 3166-2:SK, codes for the regions of Slovakia .sk, the internet country code top-level domain for Slovakia Slovak koruna, a former currency of Slovakia Slovak language (ISO 639-1 language code "sk")
Other sk. sokak, Turkish postal abbreviation South Korea, an Asian country Saskatchewan, a Canadian province by postal abbreviation Sikkim, a state in northeastern India (ISO 3166-2 code) Kingdom of Sikkim, a former monarchy in South Asia (ISO 3166-1 alpha-2 code: SK, now deprecated), an Indian protectorate merged with it as a state in 1975 Svidník, Slovakia, vehicle plates Sisak, vehicle plate for city in Croatia South Kingstown, Rhode Island, a United States town Sultan Kudarat, province in Soccsksargen, the Philippines
Science and technology sk (unit) (Skot), an old and deprecated unit of measurement for dark luminance SK (people mover), a vehicle SK calculus, an alternate form of SKI combinator calculus SK radar, an American air-search radar used during World War II Silent key, an amateur radio operator who has died "Stop keying", a prosign used in Morse code Super-Kamiokande, a Japanese neutrino detector
Biology SK channel, small conductance calcium-activated potassium channels, a family of ion channels
Medicine Solar keratosis or senile keratosis Streptokinase, a bacterial enzyme used in the treatment of blood clots
Sport SK Gaming, an electronic sports team
Other uses Regulation S-K, regarding financial statements in the United States Sekolah Kebangsaan, a type of school in Malaysia Storekeeper, a naval rating in the United States Navy Senran Kagura (SK), video game series Satakunnan Kansa, a Finnish newspaper