Star forming regions are expected to show linear proper motions due to the relative motion of the Sun with respect to the region .
These proper motions appear superposed to the proper motions expected in features associated with mass ejection from the young stellar objects embedded in them .
Therefore , it is necessary to have a good knowledge of the proper motions of the region as a whole in order to correctly interpret the motions associated with mass ejection .
In this paper we present the first direct measurement of proper motions of the NGC 1333 star forming region .
This region harbors one of the most studied Herbig-Haro systems , HH 7-11 , whose exciting source remains unclear .
Using VLA A configuration data at 3.6 cm taken over 10 years , we have been able to measure the absolute proper motions of four thermal sources embedded in NGC 1333 .
From our results we have derived the mean proper motions of the NGC 1333 star forming region to be \mu _ { \alpha } \cos \delta = 9 \pm 1 mas yr ^ { -1 } and \mu _ { \delta } = - 10 \pm 2 mas yr ^ { -1 } .
In this paper , we also discuss the possible implications of our results in the identification of the outflow exciting sources .