Pleomorphism may refer to:
*
Pleomorphism (cytology), variability in the size and shape of cells and/or their nuclei
*
Pleomorphism (microbiology)
In microbiology, pleomorphism (from Ancient Greek , ''pléō'', "more", and , ''morphḗ'', form), also pleiomorphism, is the ability of some microorganisms to alter their morphology, biological functions or reproductive modes in response to envir ...
, the ability of some bacteria to alter their shape or size in response to environmental conditions
* A life cycle of certain fungi where different stages have different morphology, see
Teleomorph, anamorph and holomorph
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