This chapter discusses our recent works on magnetization dynamics of reconfigurable 2D magnonic crystals. The chapter is broadly divided into two parts. The first part begins by examining the influence of neighboring dipolar interactions on a single Ni80Fe20 (NiFe) disk using microfocused Brillouin light scattering (µ-BLS) spectroscopy. Using pairs of identical NiFe disks of reducing interdisk spacing, marked spectral and spatial shifts of the resonant mode are observed because of increasing dipolar interactions. Beyond a two-disk system, we found that by coupling more disks as a cluster, a unique dynamic response can be realized depending on the number of disks involved and their configuration. The second part shows examples of design and fabrication strategies for creating nanomagnet networks with reconfigurable magnetic ground states. For instance, using rhomboid nanomagnet (RNM) networks, a reliable reconfiguration between ferromagnetic, antiferromagnetic, and ferrimagnetic ground states can be realized. The deterministic magnetic ground-state configuration is achievable owing to the inherent shape anisotropy that stabilizes the RNMs to a specific ground state upon field initialization along their short axis. The reconfiguration is also apparent in the magnetization dynamics, as systematically investigated using broadband ferromagnetic resonance (FMR) and µ-BLS spectroscopy techniques. © 2017 Pan Stanford Publishing Pte. Ltd.