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Mahdi Khalaf al Shamrani was found guilty of killing Saeed Msaed al Aklabi following a dispute over land, the interior ministry said.
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He was executed in the southwestern mountainous city of Abha, the ministry said in a statement carried by SPA state news agency.
Drug trafficking, rape, murder, apostasy and armed robbery are all punishable by death under the Gulf kingdom's strict version of Islamic Sharia law.
Amnesty International said in its annual report released on Wednesday that death sentences are often imposed "after unfair trials".
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The London-based watchdog said some defendants claimed to have been tortured or "otherwise coerced or misled into making false confessions" before trial.
According to an AFP count, the kingdom executed 87 people last year, up from 78 in 2013.
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