The Paris-based Organisation for Economic Cooperation and Development said its leading indicator covering 33 member countries was unchanged in April for the sixth month in a row at 100.6, above its long-term average of 100.
The indicator, designed to flag turning points in the economic cycle, suggested there was "stable growth momentum" in the bloc of mostly wealthy developed nations, the OECD said.
However growth was below trend in Brazil, China and Russia while India's reading was steady at 97.9, which the OECD described as a tentative positive turning point in the country's economic cycle.
The outlook was stable in the United States, with a 100.5 reading unchanged for months. The OECD said the euro area saw a positive change in momentum with a reading of 101.1, which was steady from March but up from previous months.
However, Japan saw its reading continue to ease, slipping to 100.6 from 100.7 as consumers adjust to the first increase in value added sales tax since 1997.