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Ideal (ethics), principles or values that one actively pursues as goals.

Ideal (ring theory), in mathematics, special subsets of a ring considered in abstract algebra.

Ideal (order theory), in mathematics, special kind of lower sets of an order.

Ideal (band), late 1990s/2000s American R&B group.

Ideal (German band), early 1980s German rock group.

Ideal Toy Company, a now defunct toy company.

IDEAL Scholars Fund, an American scholarship program for underrepresented students.

iDEAL, a Dutch Internet payment method

Ideals (magazine), a discontinued magazine that was published in the United States.

Thought experiment, sometimes called an ideal experiment.

Ideal (sitcom), a British sitcom

Platonic ideal, a philosophical idea of trueness of form, associated with Plato

Ideal gas law, in physics, governing the pressure of an ideal gas.

Ideal chain, in science, the simplest model describing a polymer.

Ideal transformer, an electrical transformer having zero resistance and perfect magnetic threading.

Ideal final result, in TRIZ methodology, the best possible solution.

Ideality, in phrenology, the disposition towards refinement and perfection.