This study examined the effect of YouTube audio-visual documentaries (YAVDs) on students' achievement and interest in History in Enugu state, Nigeria. Six hypotheses guided the study using a quasi-experimental research design. Multi-stage sampling techniques were used to sample 70 Senior Secondary two students (SS2) in four intact classes. Data were collected using History Achievement Test (HAT), which yielded 0.65 reliability index using Kuder-Richardson Formula 20 (KR[subscript 20]), and History Interest Inventory Scale (HIIS), which yielded 0.78 reliability index using Cronbach Alpha. Analysis of Covariance (ANCOVA) was used to test the null hypotheses at 0.05 significant level. The findings revealed that there was a significant difference between the achievement and interest of students taught History using YouTube Audio-visual documentaries (YAVDs) and those taught without. Recommendations focused on teachers' empowerment by the governments on how the use of YAVDs in teaching History.