{{Infoboks fodboldbiografi
| name = Mariann Gajhede
| image = Mariann Gajhede Knudsen (2).jpg
| image_size = 
| fullname = Mariann Gajhede Knudsen
| birth_date  = {{birth date and age|1984|11|16|df=yes}}
| birth_place = [[Skagen]], [[Danmark]]
| currentclub = 
| clubnumber = 
| height = {{height|m=1,78}}
| position = [[Midfielder]]
| youthyears1=
| youthclubs1= Skagen IK
| years1 = 2001
| years2 = 2002–2010
| years3 = 2011–2016
| clubs1 = [[B52/Aalborg Fodbold Club|B52]]
| clubs2 =[[Fortuna Hjørring]]
| clubs3 = [[Linköpings FC]]
| caps1= 
| goals1 = 
| caps2 = 
| goals2 = 
| caps3 = 51
| goals3 = 3
|nationalyears1 = 2002 |nationalteam1 = {{fhold|Danmark|k|19}} |nationalcaps1 = |nationalgoals1 =
| nationalyears2= 2003–2014
| nationalteam2= {{fhold|Danmark|k}}
| nationalcaps2= 103
| nationalgoals2 = 6
| club-update = 20:02, 10 July 2013 (UTC)
| nationalteam-update = 17:16, 15 November 2014 (UTC)
}}
'''Mariann Gajhede Knudsen''' (født [[16. november]] [[1984]]) er en tidligere professionel fodboldspiller fra [[Danmark]]. Hun spillede [[central midtbane]] for [[Linköpings FC]] i [[Sverige]]s [[Damallsvenskan]], samt tidligere for [[Fortuna Hjørring]] og [[B52/Aalborg Fodbold Club|B52]] i Danmark.
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