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

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

Thought experiment, sometimes called an ideal experiment

Ideal (TV series), a British situation comedy

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

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

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

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

Ideal (set theory), a collection of sets regarded as "small" or "negligible"

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

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

Ideal, Georgia, a community in the United States

Ideal Toy Company, a now defunct toy company

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

IDEAL Scholars Fund, an American scholarship program for underrepresented students

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

Ideality (Phrenology), in phrenology, the disposition towards refinement and perfection