Should courts, when applying foreign law, assess the validity or legality of foreign legislative or executive acts therein? The foreign act of state doctrine answers that question in the negative, but is often criticised as lacking a sound theoretical basis. This article argues, however, that the doctrine remains defensible if reconceptualised as a rule of private international law, which furthers the modest goal of international uniformity within the choice-of-law process. Assessing the validity or legality of foreign legislative and executive acts necessarily requires courts to address questions of foreign public law. [---]