A ruler is a device used to measure distances or draw straight lines.

Look up ruler in Wiktionary, the free dictionary.

Ruler may also refer to:

• A person who wields significant or total political power
• Ruler (film), a 2019 Indian Telugu-language action film
• Ruler (gamer), stage name of League of Legends player Park Jae-hyuk
• Ruler (horse), a racehorse
• Golomb ruler, comprises a series of marks such that no two pairs of marks are the same distance apart
• Slide rule, a mechanical analog computer
• "Ruler", a song by Marnie Stern from This Is It and I Am It and You Are It and So Is That and He Is It and She Is It and It Is It and That Is That

• Rule (disambiguation)

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