The synthesis of indolizine derivatives and their related compounds using ketene dithioacetals is described. This review is concerned with following five items : 1) the 1, 5-dipolar cyclization ; 2) the reaction of picolinium salts with ketene dithioacetals ; 3) the reaction of 2-pyridyl ketene dithioacetals with α-halocarbonyl compounds ; 4) the reaction of pyridinium or isoquinolinium ketene dithioacetals ; 5) the reaction of N-imines or S-imine with ketene dithioacetals.