There isn't a universally agreed upon list of the smallest constellations, as different sources may have different criteria for size and how they define the constellation boundaries. However, some of the smallest constellations often mentioned include:

* Crux (Southern Cross): This is the smallest constellation in terms of area. It is easily recognizable in the Southern Hemisphere.

* Equuleus (the Little Horse): This constellation is also quite small and is located in the Northern Hemisphere.

* Sagitta (the Arrow): This constellation is often cited as another one of the smallest in the sky.

It's worth noting that the sizes of constellations can be subjective, depending on how their boundaries are defined and how they are measured.