शौचालय एक ऐसी सुविधा है जो मानव के मल एवं मूत्र के समुचित व्यवस्था के लिये प्रयोग किया जाता है। शौचालय शब्द का प्रयोग उस कक्ष के लिये किया जा सकता है जिसमें मल-मूत्र विसर्जन कराने वाली युक्ति लगी होती है; या यह उस युक्ति के लिये भी प्रयुक्त होता है।

A toilet is a piece of sanitary hardware that collects human urine and feces, and sometimes toilet paper, usually for disposal. Flush toilets use water, while dry or non-flush toilets do not. They can be designed for a sitting position popular in Europe and North America with a toilet seat, with additional considerations for those with disabilities, or for a squatting posture more popular in Asia, known as a squat toilet. In urban areas, flush toilets are usually connected to a sewer system; in isolated areas, to a septic tank. The waste is known as blackwater and the combined effluent, including other sources, is sewage. Dry toilets are connected to a pit, removable container, composting chamber, or other storage and treatment device, including urine diversion with a urine-diverting toilet.