The Oscar winner's ex-wife first filed for divorce back in April 2009.
The judgment entered by Superior Court Judge Mark Juhas keeps virtually all details of the pair's split confidential. Neither Gibson nor his ex-wife, whose name is being restored to Robyn Moore, attended Friday's proceedings.
The former couple have seven children together, but only their 12-year-old son is a minor and subject to a custody agreement.
The Gibsons' divorce has been dramatically more low-key than Gibson's custody battle with Russian musician Oksana Grigorieva, who the "Braveheart" star agreed in August to pay $750,000 to settle a bitter dispute and split custody of their young daughter.
Grigorieva accused Gibson of domestic violence and he pleaded no contest, although admitted no fault, to a misdemeanor battery count earlier in March.
Attorneys handling the divorce have worked for months to reach a settlement in the case and records show Robyn Moore signed the final judgment last week. Gibson signed it Wednesday, records show.
The Associated Press contributed to this report.
