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Monodisperse MnFe₂O₄ nanoparticles with cubelike and polyhedron shapes were synthesized by reaction of Fe(acac)₃ and Mn(acac)₂ with 1,2-hexadecanediol, oleic acid, and oleylamine. Controlled evaporation of the particle dispersion led to nanoparticle superlattices. The crystal orientation of the particle in the assembly depends on the shape of the particles, with particles in a cubelike shape showing (100) texture and those in the polyhedron shape exhibiting (110) texture.