The world number one faced Ons Jabeur – who had been on an 11-match winning run – in Monday's (AEST) final in Rome and simply had too much for the Tunisian.
Swiatek won 6-2 6-2, with the 20-year-old Pole getting an early break to establish a 3-0 lead that put her in control of the first set.
As it happened, last week's Madrid Open champion Jabeur never managed to wrest control back from her opponent – her only break of the match came while 4-1 down in the second, with Swiatek digging deep to save four break points in her next service game.
Swiatek then saw things out to defend her Rome title and add to her impressive recent streak.
Additionally, Swiatek has emerged victorious from every WTA 1000 event she has entered this season, having previously won in Doha, Indian Wells and Miami.
But she was quick to salute Jabeur's efforts after another commendable showing.
Swiatek said: "I want to congratulate Ons because she had such a good run on the clay court.
"You have shown fight, spirit, so much variety that it's really nice to have you on tour. Your tennis is different and your tennis is really interesting for women's tennis I think."
As for her own performances, Swiatek added: "It wasn't easy for the whole week to play every day, but the crowd gave me so much energy.
"It was so nice to play here, be in Rome, and I agree with Ons in terms of good pasta! And today I'll celebrate with a lot of Tiramisu – no regrets!"
Swiatek now heads to Roland Garros – the scene of her first and only previous grand slam success in 2020 – as the firm favourite.