Joseph Matthew Alwyn (born 21 February 1991) is an English actor and songwriter. Born in Tunbridge Wells, Kent, England, and raised in North London, Alwyn developed interest in acting during his teens and joined the National Youth Theatre in 2009. 

He began by acting in two student productions at Edinburgh Festival Fringe, and graduated with BA degrees in English literature/drama and acting from the University of Bristol (2012) and the Royal Central School of Speech and Drama (2015), respectively.

Alwyn made his feature film debut with the titular character of Ang Lee's 2016 war drama, Billy Lynn's Long Halftime Walk, and has since played supporting roles in critically acclaimed films such as The Favourite (2018), Boy Erased (2018), Mary Queen of Scots (2018), and Harriet (2019). 

He won the Trophée Chopard at the 2018 Cannes Film Festival in recognition of his talent as a young actor.

In 2020, Alwyn co-wrote or co-produced select songs, such as "Exile", "My Tears Ricochet", "August", and "Betty", from American singer-songwriter Taylor Swift's eighth studio album, Folklore. "Exile" charted inside the top 10 in eight countries. 

He continued collaborating with her, co-writing three tracks—"Champagne Problems", "Coney Island" and "Evermore"—on her follow-up record, Evermore. For his contributions to Folklore, Alwyn won the Grammy Award for Album of the Year at the 63rd Annual Grammy Awards in 2021.

 In 2022, he appeared in lead roles of Hulu television series Conversations with Friends and romantic thriller film Stars at Noon, the latter of which won the Grand Prix at the 2022 Cannes Film Festival.

Though Swift and her boyfriend of five years are rarely pictured together, the couple were photographed grabbing iced coffees in London on July 14.

In the photos, which can be viewed here, Swift braved the London heat wave in a pair of loose denim shorts, a grey tank top, and a light blue button-down shirt. Meanwhile, Alwyn wore his own pair of blue shorts and a white t-shirt.

The pop star and the actor both topped off their looks with sunglasses, baseball hats, and sneakers.