In the new Asian Development Outlook (ADO) 2016, ADB forecasts gross domestic product (GDP) growth at 5.7 per cent in 2016 and 2017 for the region.
In 2015, GDP growth was 5.9 per cent.
The ADO Supplement released in December had projected developing Asia to grow at 6 per cent in 2016.
"Growth is slowing across much of developing Asia as a result of the continued weak recovery in major industrial economies and softer growth prospects for the People's Republic of China (PRC). This will combine to push growth in developing Asia for 2016 below previous projections," ADB said.
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India, ADB said, will remain one of the fastest growing major economies in the period ahead.
Growth will dip to 7.4 per cent in 2016-17 and with measures to fund stalled projects and an uptick in bank credit, it will pick up to 7.8 per cent in 2017-18. India's economy expanded by 7.6 per cent in 2015-16.
ADB further said potential interest rate hikes by the US
Federal Reserve, combined with broader weakness of emerging markets, signal that risks to Asia's growth forecast remain "tilted to the downside".
Developing Asia will contribute around 60 per cent of global growth in the next 2 years.
"Solid growth in India and a pick-up in aggregate growth in the Association of Southeast Asian Nations (ASEAN) will help balance continued growth moderation in the People's Republic of China," ADB said.
It added that countries across the region should continue to implement productivity-enhancing reforms, investment in under-supplied infrastructure and sound macroeconomic management to help increase their growth potential and insulate themselves from global instability.
"Stronger consumption and investment in the US will be tempered by soft external demand. Both the eurozone and Japan will see slightly improved prospects," the report said.