The ongoing pandemic outbreak of coronavirus disease 2019 (COVID-19) has been caused by the new betacoronavirus (BetaCoV) severe acute respiratory syndrome-related coronavirus 2 (SARS-CoV-2). Together with other epidemic outbreaks of BetaCoV infectious diseases (Severe Acute Respiratory Syndrome (SARS) in 2002-2003 in China and Middle East Respiratory Syndrome (MERS) in 2012 in the Middle East, which have been caused by SARS-CoV and MERS-CoV, respectively), these events have generated interest in the coronaviruses (CoVs). Although many phylogenetic analyzes have been reported at a gene or protein level, there is no study as yet encompassing the many sequences publicly available for BetaCoVs, including those that have been manipulated in the lab. In this study, the phylogenetic analysis of 679 different S1 protein sequences of BetaCoVs from a total of 1595, which are publicly available in GenBank from the beginning of the pandemic event to April 2020, has been carried out. The S1 subunit is one part of the S (spike) protein, one of three CoV envelope proteins. The S1 subunit contains a host cell receptor binding domain. This domain is essential in the initiation of the infectious process. Therefore, its phylogenetic analysis is very important for studying CoV evolution. The phylogenetic analysis of BetaCoV S1 protein presented herein shows the evolutionary history of BetaCoVs from bovine CoV to SARS-CoV-2.