In general, polymorphism describes multiple possible states for a single property (it is said to be polymorphic, or polymorphous).

Polymorphism may be:

• Polymorphism (biology), having multiple alleles of a gene within a population, usually expressing different phenotypes, which include Single nucleotide polymorphisms (SNPs).
• Polymorphism (computer science), a mechanism allowing a given function to have many different specifications, depending on the type(s) to which it is applied.
• Polymorphism (materials science), the ability of a solid material to exist in more than one form or crystal structure.
• Polymorphism (plant science), the ability of a plant to produce both quiescent and dormant seeds.

Polymorphism may also refer to:

• Polymorphic code, self-modifying code designed to defeat antivirus programs.

Polymorphie | Polümorfism | Polimorfismo | Polymorphisme | פולימורפיזם | Polimorfizmas (reikšmės) | Polymorfisme | Polimorfizm | Полиморфизм