The paper investigated the Awareness of Librarians on the adoption of Library 2.0 applications for Service delivery in University Libraries in Kano State. Data was collected from 132 Librarians working in universities in Kano state of Nigeria through the use of quantitative survey technique as the methodology of the study. Findings of the paper revealed that there was high level of library 2.0 awareness among the librarians studied. However, all common library 2.0 applications are known by the librarians with facebook being the most known library 2.0 tool, followed by twitter, instant messaging, you tube, blog wikis, RSS feeds, podcast and vodcast, and flickr being the least known. the study also established that, the major source of the librarians’ awareness of individual library 2.0 tools is the immediate friends/ colleagues, followed by Search engines, co-worker and/or professional colleagues, library websites, formal training from library schools, workshops/ conferences and seminar and tutorials being the least in that order.