Ideas usually refer to a person's thoughts or a developed concepts.
Ideas may also refer to:
- I-DEAS, the CAx software
- Ideas: General Introduction to Pure Phenomenology, a book by Edmund Husserl
- Ideas (radio show), a Canadian radio program
- Ideas (retailer), a Pakistani retail chain
- Institute for Democracy and Economic Affairs, or IDEAS, a Malaysian think tank
- International Defence Exhibition and Seminar, a major biennial defence event based in Pakistan
- LSE IDEAS, an international affairs research centre at the London School of Economics
- Theory of forms, or theory of ideas, a theory of abstract entities created by Plato, referred to as Ideas or Forms