AMSTERDAM--Dutch central bank president Klaas Knot said Sunday he didn't support the European Central Bank's new bond-buying program.

Mr. Knot, who sits on the ECB's Governing Council, said in an interview on Dutch television that he wasn't convinced of the "necessity and effectiveness" of the program, known as quantative easing.

"Even if you believe it worked [in the U.S.], you cannot project its alleged success onto the eurozone," he said on the talk show "Buitenhof."

The ECB said Thursday it plans to buy more than EUR1 trillion $1.13 trillion) of public- and private-sector bonds by the fall of 2016, in a landmark attempt to combat ultralow inflation and economic stagnation in the eurozone.

Mr. Knot and German central bank chief Jens Weidmann have been vocal critics of the program.

Write to Maarten van Tartwijk at maarten.vantartwijk@wsj.com

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