Per Nils Johan Alfred Malmer (May 25, 1928 in Växjö – April 17, 2018) was a Swedish plant ecologist.
Malmer graduated (1957) and took his PhD (1962) in plant ecology (Studies on mire vegetation in the archaean area of southwestern Götaland (South Sweden)) at Lund University.
He served as vicedean at the Faculty of Science at Lund University 1974-1989.
His research has focused on carbon cycling in boreal and Arctic peatland.
This research has included studies of past and present productivity and decay losses in Sphagnum-dominated mires.