The stress and displacement fields of an edge dislocation near a semiinfinite or a finite interfacial crack are formulated by using the complex potential theory of Muskhelishvili?s elasticity treatment of plane strain problems. The image forces exerted on the dislocation have an oscillatory character (with respect to the dislocation position) if the dislocation is originated elsewhere and moves to the vicinity of a finite interfacial crack. There is no such oscillation of image forces if the edge dislocation is emitted from the finite interfacial crack or if the crack is semiinfinite. The stress intensity factors produced by the edge dislocation also have an oscillatory character for both semiinfinite and finite interfacial cracks. They also depend on whether the dislocation is emitted from the crack or comes from elsewhere.