There is a growing interest in fungi and mycelium as a material, the ever-branching connecting threads of the fungal world. The entanglements and how this rhizomatic network functions is not just a fascinating ecological system and material, but carries a profound usefulness as a metaphor for our potential new systems, ways of thinking and behaviors. Let's Become Fungal! takes its inspiration from the world of art and mycology and shares a range of innovative and Indigenous practices from Latin America and the Caribbean that are rooted in multispecies collaboration, symbiosis, alliances, non-monetary resource exchange, decentralization, bottom-up methods and mutual dependency-all in line with the behavior of the mycelium. Every chapter is phrased as a question. They do not lead to answers, but to twelve teachings addressing for instance collaboration, decoloniality, non-linearity, toxicity, mobilization, biomimicry, death, and being non-binary. Simultaneously it ventures deeper into the world of fungi. The teachings from the fungus may inspire artists, collectives, organizations, educators, policy-makers, designers, scientists, anthropologists, change-makers, curators, urbanists, activists, gardeners, community-leaders, farmers, and many others, to become more fungal in their ways of working and being.