Mohammed Sadiq Hanif was arrested during his attempt to smuggle "a large amount" of heroin, the ministry said in a statement carried by the official SPA news agency.
Last month, Saudi authorities beheaded four Pakistanis convicted of smuggling heroin into the kingdom.
The government "is keen on combating narcotics due to their great harm to individuals and the society," the interior ministry said.
The beheading Wednesday in the eastern town of Khubar raises to 64 the number of death sentences carried out in the kingdom this year, despite international concern.
A United Nations independent expert called in September for an immediate moratorium on the death penalty in Saudi Arabia.
Christof Heyns, the UN special rapporteur on extrajudicial, summary or arbitrary executions, said trials "are by all accounts grossly unfair" and defendants are often not allowed a lawyer.
He said confessions were obtained under torture.
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...But why does Pakistani Govt fail to catch these trafickkers before they depart from the country...?
God should give some common sense to the killers and peace to the departed soul. Saudi Arabia schools have dictionary with the word MERCY missing.