The couple were detained by police after the woman was caught driving on Thursday in the Qatif district in Eastern Province, the Saudi Gazette reported.
Police made the the couple sign a pledge not to repeat the offence before they were released on bail.
The man, 28, was fined Saudi Riyals 900 (about Rs 15,000) and his car was impounded for seven days for allowing his wife to drive, the report said.
There is a de facto ban on female drivers in Saudi Arabia.
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Women in Saudi Arabia have been defying their nation's de facto ban on driving by getting behind the steering wheel.
Over the past six months, a campaign for change has gathered pace on social media.
The movement for driving rights began in mid-2011 but has not changed the law.