Semiconductor assemblies and packages using edge stacking and associated systems and methods are disclosed herein. A semiconductor package may include (1) a base substrate having a base surface, (2) one or more dies attached over the base surface, and (3) a mold material encapsulating the base substrate and the one or more dies. The package may further include connectors on a side surface thereof, wherein the connectors are electrically coupled to the base substrate and/or the one or more dies. The connectors may be further configured to electrically couple the package to one or more neighboring semiconductor packages and/or electrical circuits.