Una macromolécula es una molécula muy grande creada comúnmente por la polimerización de subunidades más pequeñas (monómeros). Por lo general se componen de miles, o más, de átomos. Pueden ser tanto orgánicas como inorgánicas y las más comunes en bioquímica son biopolímeros (ácidos nucleicos, proteínas, carbohidratos y polifenoles) y grandes moléculas no poliméricas (como lípidos y macrociclos). Son macromoléculas sintéticas los plásticos comunes y las fibras sintéticas, así como algunos materiales experimentales, como los nanotubos de carbono. El término macromolécula se refería originalmente a las moléculas que pesaban más de 10.000 dalton de masa atómica. aunque pueden alcanzar millones de UMAs.

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The term macromolecule (macro- + molecule) was coined by Nobel laureate Hermann Staudinger in the 1920s, although his first relevant publication on this field only mentions high molecular compounds (in excess of 1,000 atoms). At that time the phrase polymer, as introduced by Berzelius in 1833, had a different meaning from that of today: it simply was another form of isomerism for example with benzene and acetylene and had little to do with size. Usage of the term to describe large molecules varies among the disciplines. For example, while biology refers to macromolecules as the four large molecules comprising living things, in chemistry, the term may refer to aggregates of two or more molecules held together by intermolecular forces rather than covalent bonds but which do not readily dissociate. According to the standard IUPAC definition, the term macromolecule as used in polymer science refers only to a single molecule. For example,a single polymeric molecule is appropriately described as a "macromolecule" or "polymer molecule" rather than a "polymer", which suggests a substance composed of macromolecules. Because of their size, macromolecules are not conveniently described in terms of stoichiometry alone. The structure of simple macromolecules, such as homopolymers, may be described in terms of the individual monomer subunit and total molecular mass. Complicated biomacromolecules, on the other hand, require multi-faceted structural description such as the hierarchy of structures used to describe proteins.　In British English, the word "macromolecule" tends to be called "high polymer".

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