The present study aimed to determine engineering students' familiarity and current understandings of sustainability as well as their attitudes toward sustainable development. 'A Survey of University Students' Views on Sustainability' originally developed by Kagawa (2007) was administered to a total of 341 engineering students at Middle East Technical University. The results of descriptive statistics showed that engineering students could not develop an adequate understanding of sustainability. Moreover, there existed some knowledge gaps in their conceptualizations of different aspects of sustainability. Engineering students declared sustainability as mostly related with environmental aspect of this term while neglecting social and economic development. On the other hand, engineering students had favorable attitudes toward sustainable development.