Ferroic phase transition molecular crystals (FPTMCs), i.e. , ferroelectrics and ferroelastics, are an important family of functional molecular materials, having merits of easy synthesis, structural tunability and flexibility, and biocompatibility. Both the ferroelectricity and ferroelasticity are fundamentally associated with structural phase transitions that account for numerous interesting and important emergent and switching properties. This article highlights the recent developments in the two types of FPTMCs and the current challenges and opportunities. Recent developments in ferroic phase transition molecular crystals (ferroelectrics, ferroelastics, and multiferroics) are highlighted.