The advancement in information and communication technologies (ICTs) has increased the generation and dissemination of information. This has created a remarkable shift from the previous promulgation of information explosion to the concept of information overload in this age, which seems to be characterised by the ease of intellectual theft in various forms. The sophistication of ICTs and the overwhelming availability of information have subjected many research outputs to the affliction of ‘copy-and-paste’ syndrome and copyright abuse; and there appears to be a dearth of literature on efforts being made by LIS professionals to tackle the challenges in Nigerian academic institutions. This study, therefore, sought to draw attention to how the challenges of plagiarism are tackled by LIS professionals in the age of information overload in Nigerian academic institutions. The study adopted the phenomenological research design of qualitative methodology, using semi-structured written interview that was developed by the researchers and sent electronically to the respondents. The data were presented textually with the insertion of verbatim quotations where necessary while the research findings were analysed using thematic analysis. Findings from the 45 respondents across the six geopolitical zones in Nigeria revealed a high level of plagiarism and a moderate level of engagement in curbing the menace by LIS professionals. The study recommends a multifaceted approach to curb plagiarism; comprising information literacy instructions in academic institutions, institutionalised adoption and access to plagiarism detection software and advocacy programmes that promote ethical writing and ICT skills for LIS professionals.