Diurnal ("daily") may refer to:

• Diurnality, the behavior of an animal that is active in the daytime
• Diurnal motion, the apparent motion of stars around the Earth
• Diurnal phase shift, a phase shift of electromagnetic signals
• Diurnal temperature variation

In astrology:

• Diurnal chart, a chart for a given date, based on the natal chart
• Diurnal planet, a planet in a sect for which the Sun is above the horizon
• Diurnal sign, a sign in the zodiac
• Diurnal arc, time expressed as right ascension

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