教宗庇护一世（Pius I，1世纪－155年7月11日），或译教宗碧岳一世，140年1月11日—155年7月11日在位。

Pope Saint Pius I (died c. 155) is said to have been the Bishop of Rome from c. 140 to his death c. 154, according to the Annuario Pontificio. His dates are listed as 142 or 146 to 157 or 161, respectively.