jats:titleAbstract</jats:title>jats:pControl of BOjats:sub6</jats:sub> octahedral rotations at the heterointerfaces of dissimilar ABOjats:sub3</jats:sub> perovskites has emerged as a powerful route for engineering novel physical properties. However, its impact length scale is constrained at 2–6 unit cells close to the interface and the octahedral rotations relax quickly into bulk tilt angles away from interface. Here, a long‐range (up to 12 unit cells) suppression of MnOjats:sub6</jats:sub> octahedral rotations in Lajats:sub0.9</jats:sub>Bajats:sub0.1</jats:sub>MnOjats:sub3</jats:sub> through the formation of superlattices with SrTiOjats:sub3</jats:sub> can be achieved. The suppressed MnOjats:sub6</jats:sub> octahedral rotations strongly modify the magnetic and electronic properties of Lajats:sub0.9</jats:sub>Bajats:sub0.1</jats:sub>MnOjats:sub3</jats:sub> and hence create a new ferromagnetic insulating state with enhanced Curie temperature of 235 K. The emergent properties in Lajats:sub0.9</jats:sub>Bajats:sub0.1</jats:sub>MnOjats:sub3</jats:sub> arise from a preferential occupation of the out‐of‐plane Mn jats:italicd</jats:italic>jats:sub3</jats:sub>jats:italicjats:subz</jats:sub></jats:italic>jats:sup2</jats:sup>jats:sub−</jats:sub>jats:italicjats:subr</jats:sub></jats:italic>jats:sup2</jats:sup> orbital and a reduced Mn ejats:subg</jats:sub> bandwidth, induced by the suppressed octahedral rotations. The realization of long‐range tuning of BOjats:sub6</jats:sub> octahedra via superlattices can be applicable to other strongly correlated perovskites for exploring new emergent quantum phenomena.</jats:p>