The Spaniard became just the second player in men's tennis history to win both Roland Garros and Queen's in the same year after he defeated Jiri Lehecka.
The 2022 champion was made to work for his victory, winning the opening set 7-5 before losing the second set tie-break to set up a deciding third set.
But the Spaniard's quality shone through, winning 6-2 in the final set to secure back-to-back tournament wins following his French Open victory just two weeks beforehand.
Speaking after his 18th consecutive win, the best streak of his career to date, Alcaraz took time to praise Lehecka, describing him as a "nightmare" to play against.
"It's really special, this trophy, this tournament for me," he said. "So I'm just happy to leave with this trophy once again.
"But I have to say to Jiri, incredible week. Honestly, your level is really, really high. I'm going to say it is a nightmare playing against you, that means how tough you are so great week. Great job. Keep it up for Wimbledon with your team."
As for his own performance, the Wimbledon favourite said he arrived in London with no expectations.
"It's been an incredible week, but I came without expectations at all," the 22-year-old said. "Just came to play good tennis, just trying to be ready as soon as possible for the grass.
"I have to say, thank you to my team for the whole week. I am lucky to have my family, a lot of friends here that made me feel really comfortable out on court so without them, that wouldn't be possible. So I have to say thank you to my team, to my family, to my friends and obviously all the people who support me during the whole week."
Next up for Alcaraz is Wimbledon and a chance to win there for the third time in his career. On his chances, the Spaniard hoped to keep his "good feelings" going.
"I'm super excited to play the first match on Centre Court when you know, once again, it's going to be a really, really beautiful moment.
"I think this tournament and lifting this trophy, it was the best preparation that I could ask for. And I will try to keep the good work, keep the good feeling, and starting the tournament at Wimbledon the best way possible.
"It's pretty long. Two weeks could be really, really long, but I will try to start the tournament in a good way, and let's see how far I will be."