Pore may refer to:

In animal biology and microbiology:

• Sweat pore, an anatomical structure of the skin of humans (and other mammals) used for secretion of sweat
• Canal pore, an anatomical structure that is part of the lateral line sense system of some aquatic organisms
• Gonopore, a genital pore present in some invertebrates, particularly insects
• An opening across both inner and outer bacterial membranes, a part of many Gram-negative bacterial secretion systems
• One of the openings communicating with the skin surface at the terminus of lactiferous ducts in milk-producing mammals

In plant biology

• Stoma, a small opening on a plant leaf used for gas exchange
• An anatomical feature of the anther in some plant species, the opening through which pollen is released
• A characteristic surface feature of porate pollen

In cell & molecular biology:

• Nuclear pore, a large protein complex that penetrates the nuclear envelope in eukaryotic cells
• Ion channel pore; The ion-selective opening in the membrane of a eukaryotic cell formed by members of the ion channel family of proteins
• A water-selective opening (water channel) in the membrane of a eukaryotic cell formed by assemblies of the protein aquaporin

In the physical sciences:

• One of many small openings in a solid substance of any kind that contribute to the substance's porosity (typical usage in earth sciences, materials science and construction)
• A small defect in the crystal structure that may arise during sintering to form solids from powders, including ceramics