Dykes and sills, formed during the magma intrusion process into the upper crust, have been observed in many geological contexts on Earth and other planets. Meanwhile, millions of hydraulic fracturing operations have been carried out in over 60 years of oil, gas, and geothermal reservoir stimulation. The two processes are connected by similar canonical mathematical models and a number of similarities in observed morphologies. However, there are also important differences, both in terms of dominant physical processes and resulting behaviors. Motivated by the similarities and contrasts in both models and observations, the objective of this session is to bring together field observations with simulations and laboratory analogue models to examine the complementarity and similarity of behaviors across natural and engineered fluid-driven fractures. We particularly encourage submissions whereby numerical and/or analogue models are used to guide interpretation of geological observations, promote geochemical/geochronological comparisons, and improve the effectiveness of reservoir stimulation.