| Sekolah Menengah Kebangsaan Undang Jelebu | |
| Motto: | Knowledge is Powerful |
| Location: | 71600 Kuala Klawang |
| Country: | Malaysia |
| Opened: | 1983 |
| Type: | National School |
| District: | Jelebu |
| Principal: | Tuan Mahat bin Bujang |
| Faculty: | 40 teachers |
| Gender: | Boys & Girls |
| Lower Age: | 13 |
| Upper Age: | 17/18 |
Sekolah Menengah Kebangsaan Undang Jelebu known also as SMK Undang Jelebu, is a secondary school located in Jelebu District, Negeri Sembilan, Malaysia. In 2009, Sekolah Menengah Kebangsaan Undang Jelebu had 840 pupils: 449 boys and 391 girls, and employed 61 teachers.