Giesecke Glacier (Danish: Giesecke brær) is a glacier in the Qaasuitsup municipality in northwestern Greenland. Its outflow is split in the center by a nunatak. Through two tongues it drains the Greenland ice sheet westwards into Kangerlussuaq Icefjord. The northern tongue (Greenlandic: Qeqertarsuup Sermia) reaches the fjord at (73°35′N55°36′W).