Organic waste, which amounts to 5.72 million tons every year in Kenya, spans diverse sub-categories including food waste, yard waste, animal waste, agricultural waste, wood waste, organic sludge, biodegradable waste and human waste (faecal sludge). Rural households typically compost around 75% of their organic waste, but only 25% is composted in urban areas. Although organic waste degrades quickly and does not stay in the environment, it emits methane emissions during degradation or incineration. The high prevalence of open defecation due to inadequate sanitation systems further contributes to these challenges, as only 30% of the population has access to safely managed sanitation services. For instance, transforming organic waste into biogas saves about 370–400 kg of carbon dioxide equivalent (CO2e) per ton, while turning it into fertilizers saves 350 kg CO2e per ton. Given the large volumes of recyclable material and its numerous applications, organic waste management is one of the most developed waste management sub-sectors in Kenya. Out of 122 waste management and circularity businesses identified through this study, 30 deal with organic waste, most of which were established over the past decade. This study employed a mixed-methods approach to conduct a deep dive into the organic waste management sub-sector in Kenya.