Oleo is a term for oils. It is commonly used to refer to a variety of things:

Margarine (pronounced /ˈmɑrdʒərɪn/ or /ˈmɑrgəriːn/), as a generic term, can indicate any of a wide range of butter substitutes. In many parts of the world, margarine has become the best-selling table spread, although butter and olive oil also...

Oleo (shock absorber), A type of shock absorbers on airplane landing gear

Oleic acid

GNU Oleo, a spreadsheet program

Oleo (composition), a Sonny Rollins bebop piece

Óleo, a city in the São Paulo state in Brazil