ENGO ( kungiyar da ba ta gwamnati ba) kungiya ce mai zaman kanta (NGO) a fagen kare muhalli . Wadannan kungiyoyi suna aiki a cikin gida da kuma duniya wanda ke sa su taka muhimmiyar rawa a wajen magance nau'o'in al'amurran muhalli daban-daban da ke faruwa a duniyar yau. Wani abin da ya fi bambanta tsakanin ƙungiyoyin sa-kai na muhalli da ƙungiyoyin muhalli shi ne, ƙungiyoyin sa-kai na muhalli suna da kundin tsarin mulki da ya bayyana ka’idojin yadda za a raba madafun iko tsakanin mutanen da ke cikin su. Daga fitowar ƙungiyoyin sa-kai na muhalli a cikin shekarata 1970s da shekarata 1980s, a baya lokacin da mutane kawai suka fara fahimtar mahimmancin lamuran muhalli, an sami cigaba da yawa don taimakawa duniya da mazaunanta. Wasu mashahuran misalan waɗannan masu ba da gudummawa sune WWF, Greenpeace, Conservation International, Ƙwararren Ƙwararren Hali, Abokan Duniya, Gidauniyar namun daji na Himalayan da Hukumar Binciken Muhalli.