Baron Jonas von Essen (born 24 April 1991) is a Swedish two-time world memory champion.

[2] In April 2019 he co-founded memoryOS, an ed-tech startup developing memory improvement software.

[3] He was the third place (behind winner Johannes Mallow and eternal runner-up Simon Reinhard) in the 21st World Memory Championships in December 2012.

In his audition, he memorized the first names of all 500 people in the audience, which led to David Batra giving him his golden buzzer and thus sending him on directly to the final.

[6] On 7 March 2020, he recalled 24,063 digits of pi, setting a new personal, Swedish, and European record.