The purpose of this paper on “Al Shabaab and its Violent Extremism in Kenya” aimed at exploring the dynamics of al Shabaab in Somalia as it affected Kenya. This descriptive research adopted judgmental sampling technique and relied mostly on secondary source (books, journal articles, monographs, internet materials etc) of data collection which were sourced in Nigerian libraries, subjected to content validity before analyzing qualitatively. Results of the findings revealed that the spillover of al Shabaab’s violent extremism to Kenya was caused by porous borders as well as local forces such as historic marginalization, propaganda technique and the presence of al Hijrah sect in Kenya. Al Shabaab has impacted negatively on Kenya’s security, diplomacy, economy as well as humanitarian services. Kenya has responded through the creation of Operation Linda Nchi and Operation Usalama Watch while United States, Africa Union Mission in Somalia, United Nations and European Union also assisted in fighting the dreaded sect according to findings. The contribution of these findings to the explanation of Rosenau’s linkage theory is excellent thereby deepening the understanding of its basic assumptions. Regrettably, Al Shabaab is still a potential threat to Kenya and the entire Horn of Africa, therefore, the paper recommends inclusive dialogue, national integration and constructive engagement as panacea for al Shabaab violent extremism.