Provided is a two-phase stainless seamless steel pipe having excellent low-temperature toughness. The two-phase stainless seamless steel pipe according to the present disclosure has a chemical composition described in the specification and a microstructure comprising 30.0-70.0% of ferrite and austenite. In a 1.0 mm × 1.0 mm square visual observation area including a thick center part and including L-direction and T-direction, four line segments extending in the T-direction and equally dividing the visual observation area into five regions in the L-direction are defined as line segments T1 through T4. Four line segments extending in the L-direction and equally dividing the visual observation area into five regions in the T-direction are defined as line segments L1 through L4. The number of intersections NT, that is, the number of intersections of line segments T1 through T4 with ferrite interfaces, is 40.0 or greater. The number of intersections NL, that is, the number of intersections of line segments L1 through L4 with the ferrite interfaces, and the number of intersections NT satisfy expression (1). Expression (1): NT/NL ≥ 2.0
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