R. G. Collingwood's re-enactment doctrine has been widely discussed in recent years by his commentators. However, most philosophers who discuss the re-enactment doctrine touch only briefly on his view of the identity of thoughts. This is surprising because Collingwood claims that the historian's successful re-enactment of the thought behind the historical agent's action involves re-thinking the same thought as the agent and not merely a copy of his thought.