This essay provides a conceptual analysis and reconstruction of the no
tion of mimetic desire, first proposed in Girard (1961). The basic ide
a behind the idea of mimetic desire is that imitation can play a key r
ole in human motivational processes. Yet mimetic desire is distinguish
ed from related notions such as social modelling and imitation. In epi
sodes of mimetic desire, the process in which the imitative agent's de
sires are formed is oriented by a particular species of belief about t
he model or mediator whose desire is copied. These 'tutelary beliefs'
essential to mimetic desire are distinguished from the 'thin' and pure
ly instrumental beliefs about the model central to Bandura's (1986) so
cial cognitive theory and similar models of observational learning. Th
e problem of the identity of the objects of desire in episodes of soci
al modelling motivates a distinction between internal and external for
ms of interpersonal mediation. Girard's claims about cognitive constra
ints associated with mimetic desire are examined, and scenarios of rec
iprocal mimetic modelling are analysed.