Toula Portokalos-Miller's life is currently in disarray. The recession has caused her travel agency and the family dry cleaners to shut down, leaving only her father Gus's family restaurant still operational. Meanwhile, her husband, Ian, serves as the principal at their teenage daughter Paris's high school.
Feeling overwhelmed by her overbearing family, Paris is applying to colleges across the country, yearning for independence and privacy from her tightly-knit clan, who can't seem to stop meddling in her life. The strain in Ian and Toula's marriage is palpable as Toula's relentless fixation on managing Paris's life increasingly drives a wedge between them.
Adding to the familial chaos, Gus is convinced of his descent from Alexander the Great and plans to write to an online ancestry site for verification. However, while going through his records, he uncovers a surprising detail: his marriage certificate with Maria was never signed by the priest, rendering their union technically invalid. Although the current priest cannot sign it, he offers to conduct a new ceremony. Gus insists that they should remarry after fifty years, but Maria has her own expectations and wants a proper proposal first. In a fit of anger, she refuses to go through with the ceremony when Gus declines to propose properly.
During a date night meant to revive their romance, Toula and Ian are caught by family members makes out in their car, adding to their troubles. When Gus winds up in the hospital, Maria initially hesitates to go, declaring she is not his wife. In desperation, Gus asks Maria to remarry him, and this time she agrees.
Maria is determined to have the wedding she never experienced, so she hires a wedding planner, but that plan goes awry when the planner leaves due to the family's outrageous demands. With everyone involved, including Ian's parents, Rodney and Harriet, plus Angelo’s business partner Patrick, they all rally together to make the wedding happen. Meanwhile, Nick encourages Angelo to inform his parents, Voula and Taki, of his relationship with Patrick. To the family's surprise, Gus’s estranged brother, Panos, shows up from Greece.
Paris receives acceptance letters from Northwestern University in Chicago and NYU in New York City. Ultimately, she decides on Northwestern to please her mother, but her great-grandmother persuades her to think about New York. Excited, Paris asks Bennett—a boy she has a crush on—to the prom. Coincidentally, he also hails from a Greek family with its fair share of eccentricities. With the prom coinciding with the wedding, Toula makes a deal with Paris that she can attend the prom if she makes it to the wedding reception after.
On their way to the church, Gus, Panos, and Taki show up intoxicated, much to the frustration of Maria, who retreats to the vestry, feeling her husband is not taking the event seriously. During the ceremony, Panos reveals that Gus professed his love for Maria, allowing it to continue despite the initial chaos. While Gus and Maria celebrate their renewed vows, Ian and Toula quietly reaffirm their commitment to one another. At the prom, Paris and Bennett share a romantic first kiss as they slow dance.
The wedding reception wraps up with Gus reading a letter that validates his ancestry claim of being a descendant of Alexander the Great. However, Ian soon realizes that Toula had forged the letter to delight her father. The film concludes with the entire family helping Paris settle into her college dorm in New York.
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