Fiber reinforced glass/epoxy laminated composites modified with either carbon nanotubes (CNTs) or carbon nanofillers (CNFs) were fabricated by filament winding. The nanofillers were incorporated into the composites either by inserting nanofilled resin interlayers or by dispersing nanofillers throughout the matrix. Conductivity measurements indicated that composites made by the first method are more conductive than composites made by the second method. Interlaminar fracture tests of unidirectionally reinforced plates along with compression-afterindentation tests of multidirectionally reinforced tubes were conducted while monitoring the through-thickness electrical resistance of the specimens. The resistance change correlated well with propagation of delamination in the interlaminar fracture tests and the onset of compressive failure of tubes.