How can the relational, embodied, and affective dynamics between horses and humans enrich, develop, or even change common understandings about leadership? Moving away from hu-man-centred conceptualizations of leadership towards radically novel, species-inclusive, and posthuman terrains, this chapter investigates the co-creation of leadership in horse–human relationships within Finnish equestrian culture. Theoretically, it combines insights from the literature on relational leadership and horse–human relationships to develop micro-level understandings of how multispecies relationships—and what the author calls expressions of more-than-human leadership—emerge and co-become in situated practices. Drawing on ethnographic material on horse–human interactions (as in groundwork and in riding), combined with interviews with professional riding instructors, the chapter analyses how horses and humans co-construct leadership relationally. Further, it develops novel, care-based understandings of leadership through sensing, relating to, and learning from horses. By seeking to shift ordinary knowing positions and power distributions through care and respect for the horse, this chapter opens up novel possibilities for co-creating leadership across species boundaries and for conceptualizing and researching leadership differently.