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'Diurnal' ("daily") may refer to:

★ Diurnal animal, a plant or animal that is active in the daytime

★ Actions which are completed in 24 hours and are repeated every 24 hours, e.g. the sun reaching its zenith.

★ Diurnal motion, the apparent motion of stars around the Earth, caused by the Earth's rotation around its axis. More generally it means ''repeating daily'' as in e.g. ''diurnal effect''

★ Diurnal phase shift, the phase shift of electromagnetic signals associated with daily changes in the ionosphere

★ Diurnal temperature variation, the daily temperature shift that occurs from daytime to night
In 'astrology':

★ Diurnal planet, a planet in a sect for which the Sun is above the horizon

★ Diurnal chart, a chart for a given date, based on the natal chart

★ Diurnal arc, the time, as expressed in right ascension, it takes a planet, point, or degree to move from its rising point to its setting point

★ Diurnal sign, a sign in the zodiac whose natural positions are on the southern hemisphere of the horoscope