| ISE | Internacia Semajnfino Esperantista | In Esperanto | → Congresses |
| ISE | Institut Syndical Européen | In French | → Organizations and associations → Labour, labour economics |
| ISE | Istituto per lo Studio degli Ecosistemi | In Italian | → Environment, environmental sciences |
| ISE | Iniziative Sviluppo Energie | In Italian | → Energy economics |