The headline HSBC India Purchasing Managers' Index (PMI) -- a composite gauge designed to give a single-figure snapshot of manufacturing business conditions -- fell from December's two-year record of 54.5 to 52.9 in January.
A figure above 50 indicates the sector is expanding, while a figure below that level means contraction.
"Manufacturing activity continued to signal improvement in January, though the rate of growth slipped to a three month low," HSBC Chief India Economist Pranjul Bhandari said, adding that the "slip can partly be attributed to consolidation after two months of impressive upticks."
"New orders, both from domestic and international sources, also continued to grow, though at a slower pace than in December. New orders were strongest in the consumer goods sector," Bhandari said.
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Meanwhile, growth of output and new business continued to have little impact on employment in January, as workforce numbers rose only marginally during the month.
On the price front, lower prices paid for metals, chemicals, plastics and energy led to the weakest rise in input costs. Accordingly, output charges rose only fractionally during the month.
The Reserve Bank of India, which last month announced a surprise rate cut of 25 basis points after maintaining a hawkish monetary stance for 20 months, is scheduled to undertake its sixth bi-monthly monetary policy review, 2014-15 on Tuesday, February 3.
While the retail inflation slipped to 5 per cent in December, the Wholesale Price Index (WPI) inflation remained near zero level (0.1 per cent).
The concerns on fiscal deficit front have also eased, especially after the government last week garnered a record Rs 22,577 crore through disinvestment of 10 per cent stake in Coal India.