A contest between the pair - dubbed as the 'heaviest boxing match in history' - was in contention for a long time, but a date and location has now officially been confirmed.
The British strongman, Hall, was named the World's Strongest Man in 2017, a title achieved the following year by Icelandic icon Bjornsson - and both men are said to now be slimming down for the move into boxing.
Last year, Bjornsson - also known for playing Gregor 'The Mountain' Clegane in Game of Thrones - broke Hall's deadlift world record of 500 kg (1,100 lb) by deadlifting 501 kg (1,105 lb).
This has stoked a bitterness between the pair which will now be settled in the ring - with both eager to prove a point when they battle it out in Florida later this year.
Since both of both men have a giant frame, it will be vital to see who keeps swift in-ring movements, but how do both fighters stack up against one another? Here's everything we know about their arranged fight so far.
When is Eddie Hall vs Thor?
The fight will take place on Saturday, September 18, with coverage expected to get underway at 11pm (BST) in the UK.
Where is Eddie Hall vs Thor?
Official advisors MTK Global have confirmed the strongman rivals will battle it out at the VyStar Veterans Memorial Arena in Jacksonville, Floria on September 18.
And MMA fans will be familiar with the 15,000-seat stadium as it was used as the UFC's coronavirus pandemic venue last year.
The PPV for the fight will be broadcast via online platform Core Sports.
The early-bird PPV offer is now available for those interested in watching the fight, with tickets for the event priced at $14.99 (£12.99).
What are their boxing records?
Eddie Hall: (0-0-0)
Hafthor Bjornsson: (0-0-2)
While Hall is yet to have a competitive bout in the ring, Bjornsson fought against Steven Ward in January, with the bout ending in a draw via unanimous decision.
Bjornsson stepped up his preparation for his fight with Hall by taking part in another exhibition - this time against professional boxer Simon Vallily.
No official winner was declared for this fight.
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