Senators in the Dutch upper house of parliament voted 38 to 36 to pass the draft bill put forward by the progressive D66 party.
The bill was already approved by the Netherlands' upper House of Representatives in September 2016, albeit by a narrow vote of 75 to 74.
Organ donations: Spain leads the global charts while Germany continues to lag
The Netherlands follows the likes of Spain, which has had its own opt-out organ donor system since 1979, and France, which introduced similar legislation in January 2017.
Germany, which has an opt-in registration system, continues to lag behind, partly thanks to a 2012 organ donor scandal.