AbstractComplex oxides are interesting materials where multiple physical properties and functionalities can be realized by integrating different elements in a single compound. However, owing to the chemical instability, not all the combinations of elements can be materialized despite the intriguing potential expected from their magnetic and electronic properties. Here we demonstrate an epitaxial stabilization of orthorhombic Ru³⁺ perovskite oxides: LaRuO₃ and NdRuO₃, and their magnetotransport properties that reflect the difference between non-magnetic La³⁺ and magnetic Nd³⁺. Above all, an unconventional anomalous Hall effect accompanied by an inflection point in magnetoresistance is observed around 1.3 T below 1 K for NdRuO₃, which we propose is possibly related to a non-coplanar spin texture on Nd³⁺ sublattice. These studies not only serve as a new testbed for the interplay between spin-orbit coupling and Coulomb interaction but also open a new avenue to explore topological emergent phenomena in well-studied perovskite oxides.