Since then, the 50-year-old Irish actor has become a frequent subject of internet humor, ranging from the global Barbenheimer phenomenon to viral comparisons with celebrity lookalikes.
| First viral meme | July 2017 Tumblr post featuring a 2015 "In the Heart of the Sea" interview |
| Meme reaction | Famously asked "What is a meme?" during an October 2017 NME interview |
| Tyler Glasnow comparison | July 2023 viral side-by-side confirmed as an AI-generated image |
| Professional lookalike | Scott Blower (Manchester, UK), active for over 10 years |
| Voldemort casting rumor | Explicitly denied by Murphy to The Times |
Long before the July 21, 2023, simultaneous theatrical release of Oppenheimer and Barbie sparked the global "Barbenheimer" trend, the 50-year-old Irish actor was already a staple of internet culture. The definitive Cillian Murphy meme originated in July 2017 when a Tumblr user posted a grid of press junket stills. Highlighting a particularly unenthusiastic expression from a 2015 interview for In the Heart of the Sea, the user captioned the images, "Cillian Murphy always looks like someone somewhere is disappointing him." The post quickly amassed 42,000 notes, and a subsequent 2018 YouTube compilation video of his unimpressed interview moments accumulated over 3.3 million views. The actor famously reacted to his viral fame during an October 2017 interview with NME by genuinely asking, "What is a meme?" It was not until the 2023 Oppenheimer press tour that he clarified he finally understands the concept, crediting his teenage sons for bringing him up to speed on internet humor.
Beyond his reluctant reactions to press junkets, the actor frequently goes viral for his striking facial features, leading to numerous celebrity lookalike comparisons. In July 2023, social media users highlighted an uncanny resemblance between the actor and MLB pitcher Tyler Glasnow. A side-by-side photo comparing their faces circulated widely, prompting widespread confusion. However, both men eventually confirmed that the viral image was not a genuine photograph but rather an AI-generated creation. Despite the digital manipulation, the Tyler Glasnow Cillian Murphy crossover amused the actor, who joked on the Happy Sad Confused podcast that Glasnow is "a lot better at baseball than me." In reality, the two share little in common physically; there is a 17-year age gap between the 1976-born actor and the 1993-born athlete, as well as a one-foot height difference, with Glasnow standing at 6'8" compared to the actor's approximate 5'9" frame.
The baseball player is not the only time the internet has found an unexpected doppelgänger for the star. In May 2021, social media users drew widespread comparisons between him and singer Billie Eilish following her British Vogue cover shoot. Fans noted that the two share distinct facial features, including pale blue eyes, high cheekbones, and pouty lips. For others, resembling the actor is a lucrative side business. Scott Blower, a 51-year-old installation manager from Manchester, UK, has worked as a professional lookalike for over 10 years, specifically mimicking the actor's Tommy Shelby persona. Blower experienced a massive surge in professional bookings during the 2024 awards season as the actor's public visibility peaked.
Internet culture has also woven the actor into various fan-casting campaigns and satirical political memes. A persistent rumor suggested a Cillian Murphy Voldemort casting for HBO's upcoming Harry Potter TV series reboot. Despite widespread fan enthusiasm and an endorsement from original Voldemort actor Ralph Fiennes, the Irish actor explicitly shut down the speculation, stating to The Times that he is "categorically not" playing the role. Meanwhile, in a more bizarre corner of the internet, satirical posts have occasionally drawn visual comparisons in a Cillian Murphy Bashar al Assad meme format. Unlike the lighthearted baseball and pop star comparisons, these political memes stem entirely from internet satire, and the actor has never publicly commented on them.
