ASE or ase can stand for:

• Academia de Studii Economice (the Economic Sciences Academy) in Bucharest, Romania
• Accelerated Solutions Environment, a Cap Gemini consulting services offering
• Accelerated Solvent Extractor, a research tool for the removal of solvents from solution
• Admiralty Signal Establishment, a defense research organization in the United Kingdom
• Advanced Semiconductor Engineering, a Taiwanese semiconductor manufacturing company
• Agence spatiale européenne, the French name for European space agency
• Ahmedabad Stock Exchange, the second oldest exchange in India
• Alberta Stock Exchange, a defunct stock exchange in Calgary, Alberta
• Alliance to Save Energy, a non-profit coalition in Washington, D.C. 
• Amalgamated Society of Engineers (disambiguation), one of several similarly named trade unions
• American Society of Echocardiography
• Amman Stock Exchange, the Jordanian stock exchange
• Amity School of Engineering, a private engineering college located in NOIDA, India
• Aspen-Pitkin County Airport (IATA airport code)
• Association for Science Education, a professional association in the United Kingdom for teachers of science
• Association for Social Economics, an international association dedicated to social economics
• Association of Space Explorers, a non-governmental space organization of international astronauts
• Athens Stock Exchange, the Greek stock exchange
• Atomstroyexport, the Russian nuclear power equipment and service export monopoly
• Australian Screen Editors (an Australian film editing guild headquartered in Sydney, Australia
• Automotive Service Excellence, a U.S.-based group to improve the quality of automobile servicing
• The former Australian Stock Exchange, now part of the Australian Securities Exchange (ASX)

Ase (pronounced Assay) is a town on the shores of the Ase Creek, off River Niger in Ndokwa East Local Government Area of Delta State, Nigeria. The Ase Creek derives its name from Ase town. Ase shares common boundaries with Ibedeni, Aviara, Uzere, Patani (all in Delta State) and Trofani (in Bayelsa State). In the colonial era, Ase served as the commercial and administrative Headquarters for the colonial administrators. Relics of colonial presence still dot the landscape. John Holt and UAC are some of the companies that had trade offices in Ase. The town is made up of descendants from Ndokwa speakers who have intermarried with the Isokos and Ijaws over the years. The Ase dialect of the Ndokwa language (a dialect of the Igbo language) is spoken by the Ase people.

The suffix -ase is used in biochemistry to form names of enzymes. The most common way to name enzymes is to add this suffix onto the end of the substrate, e.g. an enzyme that breaks down peroxides may be called peroxidase; the enzyme that produces telomeres is called telomerase. Sometimes enzymes are named for the function they perform, rather than substrate, e.g. the enzyme that polymerizes (assembles) DNA into strands is called polymerase; see also reverse transcriptase.

Åse [pronounced aw-seh] is a Norwegian feminine name. It may refer to the following:

• Åse, character in the play Peer Gynt by Henrik Ibsen
• Åse Kleveland, Swedish-Norwegian singer and politician
• Åse Klundelien, Norwegian politician