The Doric order was one of the three orders or organizational systems of ancient Greek or classical architecture; the other two canonical orders were the Ionic and the Corinthian.

In their original Greek version, Doric columns stood directly on the flat pavement (the stylobate) of a temple without a base; their vertical shafts were fluted with 20 parallel concave grooves; and they were topped by a smooth capital that flared from the column to meet a square abacus at the intersection with the horizontal beam (entablature) that they carried. The Parthenon has the Doric design columns.

Pronounced features of both Greek and Roman versions of the Doric order are the alternating triglyphs and metopes. The triglyphs are decoratively grooved with three vertical grooves ("tri-glyph") and represent the original wooden end-beams, which rest on the plain architrave that occupies the lower half of the entablature. Under each triglyph are peglike "stagons" or "guttae" (literally: drops) that appear as if they were hammered in from below to stabilize the post-and-beam (trabeated) construction. They also served to "organize" rainwater runoff from above. A triglyph is centered above every column, with another (or sometimes two) between columns, though the Greeks felt that the corner triglyph should form the corner of the entablature, creating an inharmonious mismatch with the supporting column. The spaces between the triglyphs are the "metopes". They may be left plain, or they may be carved in low relief.