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Some of the most recent contributions to the theory of defense mechanisms are critically reviewed including theories of complex motivational properties of the ego (Schafer, 1968); (Kris, 1984), a functional theory of defense (Brenner, 1982), an object-representational theory of defense (Kernberg, 1976), a "two-person" theory of defense (Modell, 1984) and a self-psychologically based theory of defense (Kohut, 1984). These recently proposed theories of defense mechanisms utilize differing levels of analytic observation and theoretical discourse. One of the major differences among theorists involves the variety of referents of defense mechanisms (i.e., what is being defended against) including impulse, drive derivative, object loss, or environmental failure. Another fundamental difference involves the variety of ways theorists regard the relation between internal homeostasis and the external world. Questions are raised about the recent tendency in psychoanalytic theory to develop or invoke different theories of defense to explain a broad range of clinical phenomena.