In the aftermath of the 2006 and 2014 Thai coups,observers declared the resurrection of thebureaucratic polity. Bureaucrats, though, remainedinfluential even during the period of 1992–2006,when elected politicians were thought to command theThai state. Bureaucratic involvement in politicsposes a challenge for dominant political sciencetheories of politician–bureaucrat relationships,which draw heavily from principal–agent frameworks.I apply agency theory to Thailand, testing threedifferent hypotheses derived from the theory.Examining legislative productivity and control overbureaucratic career trajectories, I find thatelected politicians increasingly acted as principalsof the Thai state from 1992 through 2006, and to alesser degree from 2008 to 2013. Thai bureaucrats,though, have frequently engaged in the politicalsphere, blunting political oversight and expandingtheir independence vis-à-vis politicians. Thissuggests that the principal–agent model overlooksthe range of resources that bureaucracies can bringto bear in developing countries, granting themgreater autonomy than anticipated. As such, theoriesof the politician–bureaucrat relationship indeveloping states need to better account for themechanisms through which bureaucrats exercise policydiscretion and political influence.