Economist Paul Dales of Capital Economics called the report "very encouraging."
"The chance that the economy is heading back into a recession has receded," he said.
However, he added, "the economy is not growing fast enough to reduce the unemployment rate or boost inflation."
0:00/:52China stocks soar on manufacturing dataAny reading above 50 signals growth. The October report marked the 15th straight month of expansion.
Dales said Monday's ISM figures will not prevent the Federal Reserve from announcing more quantitative easing on Wednesday, but increases the chances that a fairly modest package will be announced.
Stocks got a boost after the report's release, with the Dow Jones industrial average up about 100 points on the day before pulling back.
China currency report delayedManufacturing (ISM)