New radial velocity measurements for previously known and newly confirmed globular clusters in the nearby massive galaxy NGC 5128 are presented . We have obtained spectroscopy from LDSS-2/Magellan , VIMOS/VLT , and Hydra/CTIO from which we have measured the radial velocities of 218 known , and identified 155 new , globular clusters . The current sample of confirmed globular clusters in NGC 5128 is now 605 with 564 of these having radial velocity measurements , the second largest kinematic database for any galaxy . We have performed a new kinematic analysis of the globular cluster system that extends out to 45 ^ { \prime } in galactocentric radius . We have examined the systemic velocity , projected rotation amplitude and axis , and the projected velocity dispersion of the globular clusters as functions of galactocentric distance and metallicity . Our results indicate that the metal-poor globular clusters have a very mild rotation signature of 26 \pm 15 km s ^ { -1 } . The metal-rich globular clusters are rotating with a higher , though still small signature of 43 \pm 15 km s ^ { -1 } around the isophotal major axis of NGC 5128 within 15 ^ { \prime } . Their velocity dispersions are consistent within the uncertainties and the profiles appear flat or declining within 20 ^ { \prime } . We note the small sample of metal-rich globular clusters with ages less than 5 Gyr in the literature appear to have different kinematic properties than the old , metal-rich globular cluster subpopulation . The mass and mass-to-light ratios have also been estimated using the globular clusters as tracer particles for NGC 5128 . Out to a distance of 20 ^ { \prime } , we have obtained a mass of ( 5.9 \pm 2.0 ) \times 10 ^ { 11 } M _ { \sun } and a mass-to-light ratio in the B-band of 16 M _ { \sun } / L _ { B \sun } . Combined with previous work on the ages and metallicities of its globular clusters , as well as properties of its stellar halo , our findings suggest NGC 5128 formed via hierarchical merging over other methods of formation , such as major merging at late times .