Murdi al-Shakra had been tried and sentenced to death for murdering fellow tribesman Faraj al-Shakra, the interior ministry said in a statement carried by the official SPA news agency.
The beheading brings to 10 the number of executions since the start of the year, according to an AFP tally.
It comes as Saudi Arabia postponed until next week Friday’s flogging of blogger Raef Badawi jailed for insulting Islam, citing medical reasons, a week after he received the first 50 of a 1,000-lash sentence.
Saudi Arabia carried out the death penalty against 87 people last year, up from 78 in 2013, according to an AFP tally.
The kingdom had the third-highest number of recorded executions in 2013, behind Iran and Iraq, Amnesty International said in a report.
Rape, murder, apostasy, armed robbery and drug trafficking are punishable by death under Saudi Arabia’s law.