Bulgarian Dimitrov held his nerve to triumph 7-5, 4-6, 6-3 in the finale of the season-ending tournament.
The 26-year-old is the first ATP World Tour Finals debutant to win the event in two decades, impressively seeing off Goffin in a thrilling clash.
The Belgian had beaten both Rafael Nadal and Roger Federer on his route to the final, but couldn’t cope with an inspired opponent.
Dimitrov collapsed on the baseline after sealing victory, appearing close to tears before hauling himself up to collect the trophy.
Scroll through the gallery above to see the best pictures as an emotional Grigor Dimitrov wins the ATP World Tour Finals.