Isachsenfonna
{{Short description|Glacier in Svalbard}}
{{Infobox glacier
| name = Isachsenfonna
| other_name =
| photo =
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| type = Plateau glacier
| location = Haakon VII Land
Spitsbergen, Svalbard
| map = Svalbard
| map_caption =Location
|coordinates = {{coord|79.1689|N|12.8829|E|type:landmark_region:NO_scale:1000|format=dms|display=inline,title}}
| mark = Blue_pog.svg
| area = {{convert|140|sqkm|abbr=on}}
| length =
| width =
| terminus =
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}}
Isachsenfonna is a plateau glacier in Haakon VII Land at the northwestern part of Spitsbergen, Svalbard. It covers an area of about 140 km2, and reaches a height of about {{convert|900|m|abbr=on}} above sea level. The glacier is named after polar scientist Gunnar Isachsen, who traversed the glacier in 1906.{{cite web |url=http://placenames.npolar.no/stadnamn/Isachsenfonna|title=Isachsenfonna (Svalbard) |publisher=Norwegian Polar Institute |accessdate=4 March 2013}}