Mtaa (kwa Kiingereza: neighbourhood ) ni sehemu ya jiji, mji au kijiji. Mahusiano ndani yake ni ya jirani zaidi, hasa kama wakazi wake wanafanana kwa asili, dini, hali ya uchumi n.k. "Neighbourhood is generally defined spatially as a specific geographic area and functionally as a set of social networks. Neighbourhoods, then, are the spatial units in which face-to-face social interactions occur—the personal settings and situations where residents seek to realise common values, socialise youth, and maintain effective social control."