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This chapter aims to examine the composting of biowaste as a suitable bioremediation method of contaminated sites with a focus on organic contaminants. The chapter analyzes different approaches in bioremediation practices through composting or land farming combined with composting of biowaste taking into considering the main organic waste streams such as municipal waste (food and garden wastes), agricultural waste, or sewage sludge. The use of compost as cosubstrates facilitates the bioaugmentation and biostimulation processes. These bioremediation practices are applied to sites contaminated with polycyclic aromatic hydrocarbons, pesticides, and petroleum products. Such applications stimulate better organic waste management practices combined with cost-efficient solutions for remediation of polluted sites. However, the performance of composting practices in soil bioremediation relies on several in situ factors. Current challenges, best practices, relevant case studies, and future prospects are further highlighted based on the literature review to reveal the state of the art on this topic.