The Norwegian clown won the £250,000 cash prize and a spot at this year’s Royal Variety Performance after being named the winner of the TV talent show - with 13-year-old gymnastic dancer Liliana Clifton and teenage magician Cillian O'Connor coming in second and third place.
Figures released by ITV show Venn scooped 22.5 per cent of the final votes, significantly more than the 10 rival acts.
Dancer Clifton was second with 13.1 per cent of the vote and illusionist O'Connor received 11.8 per cent of the public votes on the night.
Teen opera singer Malakai Bayoh was close fourth with 11.3 per cent of the votes placed during the grand final.
The number of votes cast has not been released but BGT saw its viewing figures fall to a record low, with just 5.3 million people tuning in to watch on the night.
This was a significant fall from 2022's 6 million viewers and continues the shows's rating slump since 2015 when 12.75 million people watched the grand final on TV.
Britain's Got Talent viewing figures peaked in 2009 when the final was viewed by 18.9 million people and saw dance troupe Diversity crowned the winners, with Scottish singing sensation Susan Boyle placed as the runner-up.
The lowest number of votes this year were cast for 'naked' poser Tonikaku from Japan, who received just 2.9 per cent of the total vote.
Venn was a stand out winner from the live semi-finals receiving the highest amount of votes cast for any of the acts in the semi-final rounds - with 43.7 per cent on night two.
Ugandan orphan dance troupe Ghetto Kids achieved 39.7 per cent of votes in their semi-final heat, but came sixth in the final with just 10.1 per cent.
And amputee dancer Musa Motha came fifth in the final with 10.9 per cent.
Some viewers expressed their disappointment on social media at seeing Venn's comedy act defeat a line-up of such unusually talented young people.
Venn — who wears hi-vis vests as part of his act — said on winning: "I feel extremely visible right now, thank you so much."
Hosts Ant McPartlin and Declan Donnelly had to apologise for the bad language during the final after Venn swore during his act.
The comedy performer Venn used the "s***" word as he pretended something had gone wrong, before asking, "Is this live?"
McPartlin said afterwards: "We must apologise for any bad language that you might have heard during that. Not naming names. Somebody did."
Watch: Ugandan orphans Ghetto Kids made the BGT 2023 final but did not win