The eighth season of Married at First Sight premiered on 22 February 2021 on the Nine Network. Relationship experts John Aiken and Mel Schilling returned from the previous season, and were joined by sexologist Alessandra Rampolla to match nine brides and nine grooms. Halfway through the experiment, the experts matched another three brides and three grooms together.
The season was heavily criticised by media outlets and fans of the show due to the lack of diversity in casting. The series also saw accusations of misogyny against a number of the male participants. In June the Australian Communications and Media Authority revealed they were looking into the season after receiving 54 complaints from viewers about the show. Several of the complaints alleged the series had aired abusive interactions between participants through "gaslighting, social, verbal and mental abuse". The Network was later cleared of any breaches.