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In a statement, the frontman announced that the four-piece want "to try new things" and pursue "other ventures".
Formed after the break-up of Barat's old group The Libertines, the band consists of drummer Gary Powell, guitarist Anthony Rossomando and bassist Didz Hammond.
"It is with some sadness we announce the farewell of the Dirty Pretty Things," said Barat.
"It's been a glorious three years which we all would gladly live out again, but it is time for us to try new things (not The Libertines)."
He continued: "We are reluctant to give up touring but will give the last waltz everything. We have and are determined to go out as we came in, after which we all have other ventures to be getting on with and splendid future plans."
Dirty Pretty Things' debut album Waterloo To Anywhere reached number three in 2006 and featured the top ten single 'Bang Bang You're Dead'.
This year's follow-up Romance At Short Notice charted at number 35.
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