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“No, I’m not going to do the Oscars,” he said. “It’s an honor to be asked by the Academy, but it’s not my year.”

Mr. Fallon’s name first popped up as a possible Oscar host last week, with a Los Angeles Times story also reporting that the show would be produced by Mr. Fallon’s former “Saturday Night Live” boss Lorne Michaels. This was said to be a bit of a conflict for Oscar network ABC, the home of Mr. Fallon’s direct competition, Jimmy Kimmel.

Visibly disappointed by the response of his NBC colleague, Mr. Lauer finished the segment, noting “that wasn’t quite the note I was hoping to end on.”

• Compiled from Web and wire reports