The warning was issued by Scottish Renewables after they obtained the figures from offshore wind developers who have projects in Scottish waters.
From its findings, the industry body suggested that £28.9m was spent in 2013, compared to an investment of £63.6m in 2012. As a result, it said that the sector could be under threat from an "investment hiatus".
Commenting on the findings, Lindsay Leask, Senior Policy Manager for Scottish Renewables, said the 55% fall in investment was concerning.
She added: "Uncertainty throughout the industry is growing as none of the major projects planned for Scottish waters have had their planning applications determined yet, and the details around accessing market incentives are still unclear.
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"With around 5 gigawatts of potential offshore wind development in planning - enough to meet the annual demand of 3 million homes – we can't afford to see these projects, and the investment decisions related to them, left in limbo.
"Scotland has all the ingredients to develop a world leading offshore wind industry. Our exceptional wind resource and internationally renowned skill sets make these projects incredibly attractive and competitive propositions. This is evidenced by the level of investment that is still coming forward from committed developers in spite of the significant challenges facing the industry.
"Yet a reduction of some 55% in a year is cause for concern not only for the sector, but should also be a worrying sign for the Scottish and UK governments too.
"We'll be working hard over the coming weeks with governments north and south of the border to ensure the developers gain the certainty they need to unlock further investment."
Scottish Renewables analysis was published ahead of a major offshore wind conference in Aberdeen later this week.
(JP/CD)
