Economic growth in the top G20 countries slowed to 0.6 percent in the second quarter of 2012 from 0.7 percent in the first quarter, with slow and weak growth set to continue, the OECD said on Thursday.
The Chinese economy picked up but output in the eurozone, Japan and South Korea slowed sharply. Britain and Italy also showed shrinking output data.
Some emerging economies showed relatively resilient growth, the data showed.
The easing for the G20 (Group of 20) area marks the third quarter running of slowing growth but "masks diverging patterns," with a moderate slowing in the United States and contraction in the eurozone, the Organisation for Economic Cooperation and Development said.
Growth in China picked up to 1.8 percent from 1.6 percent and in Brazil to 0.4 percent from 0.1 percent, in Indonesia to 1.6 percent from 1.4 percent and in South Africa to 0.8 percent from 0.7 percent.
Turkey achieved a turnaround from contraction of 0.1 percent to growth of 1.8 percent.
In Japan growth fell to 0.2 percent from 1.3 percent and in South Korea top 0.3 percent from 0.9 percent output. In Australia, output also slowed sharply to 0.6 percent from 1.4 percent.
The slowdown was less marked in the United States where activity growth eased to 0.4 percent from 0.5 percent, in Germany to 0.3 percent from 0.5 percent and in India 0.8 percent from 1.1 percent.
Output in France was flat at zero in both quarters.
In Britain output contracted for the third quarter running, to minus 0.5 percent from minus 0.3 percent, and in Italy for the fourth quarter, which showed minus 0.8-percent growth in the last two quarters.
For the whole of the 27-nation European Union, output contracted by 0.1 percent from a zero reading in the first quarter and for the 17 eurozone countries it shrank by 0.2 percent from growth of 0.4 percent.
According to the OECD's composite index of leading indicators slowing and weak growth is set to persist in the coming quarters in most leading economies.
The eurozone looks set to achieve weak growth, led by France and Germany. Italy is set for a further slowdown, however.
Data also points to a further slowdown in China, India and Russia.
But Britain and Brazil look set for a pick up in growth, while Japan and United States should still see above trend growth if slowing from previous quarters, said the OECD.
In a separate report, the OECD warned Southeast Asian nations would also likely be buffeted by the slowdown in the eurozone and China.
"Continued euro area uncertainty will remain a major downside risk for the ASEAN economies," the OECD said.
"In addition, 'indirect channels' of euro area uncertainty through China -- via weakening China's exports to Europe -- will have a non-negligible impact on Southeast Asia," it added.