Although GFRP has a much higher strength-to-weight ratio than conventional materials such as steels and concrete, it suffers from poor “local” resistance to the indentation damage, often introduced by transverse point loading. This is due to the inherent in-plane reinforcement of fiber, which does not provide any strengthening of the GFRP in the out-of-plane direction. Most of the indentation damages generated by transverse loading appear to be small, with a size similar to the contact area, thus being deemed to have little effect on the over-all properties of the GFRP. Consequently, little attention has been paid in the past to understand how material parameters of the GFRP affect its resistance to the indentation. This concept, however, is being challenged by applications such as boat hulls and bridge decks that use thick GFRP laminates. For these types of applications, indentation damage is the most common mechanism that initiates damages such as delamination under the contact surface [1–3], causing significant loss of structural integrity and possibly catastrophic failure. Most research work on indentation of fiber composites [4–6] dealt with damages that were a combination of local indentation and sub-surface delamination. This was because specimens used were not stiff enough to prevent delamination under the contact point. Therefore, the results failed to isolate the indentation damage from other fracture mechanisms, producing information that was not applicable when knowledge of pure indentation damage was required. As the first step to characterize fiber composite’s resistance to indentation damage, a series of experiments were conducted to measure energy absorbed by fiber composites that were subjected to pure indentation damage. This paper summarizes results from the indentation tests, and discusses its significance in over-all energy absorption of GFRP under transverse loading. The two GFRP used in the study have the same fiber volume fraction and lay-up, but different resins for the matrix. One resin was pure isophthalic polyester (TMR300 iso-polyester, provided by Viking Plastics, Edmonton) and the other polyurethane resin with 15% CaCO3 particles (PUL-G resin, provided by Resin Systems Inc., Edmonton). The fiber used was warp unidirectional glass fiber fabric of 9 oz/yd2, which consists of unidirectional fiber bundles that are held in parallel at a distance of approximately 1 mm apart by stitching thread [7]. The fiber lay-up is [(0/90)5]s that forms a nominal specimen thickness of 6 mm with the maximum variation of ±0.05 mm. A resin transfer molding technique was used for the GFRP fabrication to ensure consistent thickness of the test coupons. Due to the inter-fiber-bundle gap, resinrich zones exist in the laminates, in the inter-laminar regions and the intra-laminar, inter-fiber-bundle regions. Overall fiber volume fraction of the GFRP was estimated to be around 40%, based on the following equation [8]