  Moir\'e engineering has recently emerged as a capable approach to control
quantum phenomena in condensed matter systems. In van der Waals
heterostructures, moir\'e patterns can be formed by lattice misorientation
between adjacent atomic layers, creating long range electronic order. To date,
moir\'e engineering has been executed solely in stacked van der Waals
multilayers. Herein, we describe our discovery of electronic moir\'e patterns
in films of a prototypical magnetoresistive oxide La0.67Sr0.33MnO3 (LSMO)
epitaxially grown on LaAlO3 (LAO) substrates. Using scanning probe
nano-imaging, we observe microscopic moir\'e profiles attributed to the
coexistence and interaction of two distinct incommensurate patterns of strain
modulation within these films. The net effect is that both electronic
conductivity and ferromagnetism of LSMO are modulated by periodic moir\'e
textures extending over mesoscopic scales. Our work provides an entirely new
route with potential to achieve spatially patterned electronic textures on
demand in strained epitaxial materials.
