Larsen began his career performing stand-up and creating
YouTube videos with
Henry Stone and
Sam Campbell as the sketch group
Skills in Time. The group had a modest 10,663 subscribers in April 2015, and the
Sydney Morning Herald note that they had "serious cred in the Melbourne and Sydney comedy scenes", noting that they were "successfully straddling the old and new comedy terrains in a way that many of the YouTubers aren't." He is known for his stand-up comedy performances, largely at the MICF. In 2014, along with
Henry Stone, Stuart Daulman, and John Campbell, Larsen was awarded the
Golden Gibbo award at the
MICF for the
Fancy Boy Variety Show. In 2016, along with
Anne Edmonds and Damien Power, Larsen was awarded the Director's Choice Award for their show
True Australian Patriots. He portrayed Dave in
Ronny Chieng: International Student in 2017, which he co-wrote with
Ronny Chieng and Declan Fay. Larsen was a cast member in the
ABC news comedy show
Tonightly with Tom Ballard which aired from 2017 to 2018. In 2017, Larsen was the focus of an
Australian Communications and Media Authority (ACMA) investigation based on his on-air conduct in which he called Kevin Bailey, a candidate for the
Australian Conservatives, a "
cunt" on air during a sketch on
Tonightly. Larsen and the ABC were ultimately cleared of wrongdoing as the investigation found that Larsen was playing the character of an "unreasonably angry man" and that the attack would have been considered "comedic" by any reasonable viewer. In the final weeks of the show, Larsen created the character Mr Oily. Larsen started a sketch comedy podcast with Ben Russell and
Anne Edmonds named
The Grub; when the
COVID-19 pandemic hit, many of its episodes were moved behind a
Patreon paywall in order to finance their work. Larsen won acclaim for his role in the MICF Great Debate event in 2021, and was again an MICF award recipient with his one-man play
This Might Not Be Hell, receiving the Piece of Wood Award. He portrayed Ethan Krum in the
BBC One series
The Tourist in January 2022, alongside
Jamie Dornan and
Danielle Macdonald. He wrote for and appeared in
We Interrupt This Broadcast on
Seven Network in 2023. In 2023, Larsen received further acclaim for his new comedy special ''Slurp's Up!!
He returned to the role of Krum in Season 2 of The Tourist'', which premiered on 1 January 2024. His performance in drew praise from
Digital Spy, as well as fellow cast members including
Conor MacNeill, saying "he's phenomenal and even just how he uses his hands is hilarious. He's a very clever comedic actor."
Chortle gave his 2024 MICF show
Revolting four and a half stars. In 2025,
Geggy, which he said would be his final festival show, premiered at the MICF and then in Sydney. It covered the events of his career that led up to his card declining at a
McDonald's drive-through; Larsen rewrote the show after experiencing this incident weeks prior to the festival.
The Guardian gave the show four of five stars, calling it a "relentless barrage of jokes". In April 2025, Larsen was the subject of several
Sky News Australia and other right-wing media outlets articles after he criticised
Anzac Day on an episode of his podcast,
The Greg Larsen Show. He stated that it "was invented as a
jingoistic, nationalistic myth to get you to wave a flag and fall in line", and "that the very existence of Anzac Day as a commemoration is a slap in the face to everyone who died at
Gallipoli." == Awards and nominations ==