The study investigated effort expectancy and behavioural intention of digital library use by engineering lecturers in various universities in South-west, Nigeria. Descriptive survey design was employed. Fifteen universities which consist of six federal, five states, and four privately-owned were purposively used for the study. The study population comprised of 1043 lecturers in the field of engineering. The total enumeration technique was employed to cover all the lecturers. The questionnaire was the instrument used to cover 1043 lecturers and 751 (72%) were returned and found usable for the study. The administration of the instrument was for the period of twenty-eight weeks (October, 2016 to April, 2017). Findings from the study show that factors of effort expectancy such as timeliness and comprehensiveness facilitate the use of digital library by engineering lecturers. The outputs of the study also indicated that plan and intend factors of behavioural intention enhance the use of digital library among this group of users. It is concluded that effort expectancy and behavioural intention were significant factors motivating the use of digital library by engineering lecturers. The study however, recommended that more attention should be paid to designing digital library for a target user community in robust and flexible manner to their needs

Keywords: Effort expectancy, behavioural intention, engineering lecturers, timeliness, comprehensiveness, plan.