Indosaurus was named by Huene (1933) [Named by Huene in Huene & Matley 1933.].

It was synonymized subjectively with Orthogoniosaurus by Romer (1956) and Romer (1966); it was considered a nomen dubium by Novas et al. (2010).

It was assigned to Carnosauria by Kuhn (1939); to Megalosaurinidae by Tatarinov (1964), Walker (1964), Steel (1970), Chatterjee (1978) and Molnar (1980); to Carnosauria by Gauthier (1986); to Allosaurinae by Paul (1988); to Majungasaurinae by Tortosa et al. (2014) and Filippi et al. (2016); to Abelisauridae by Bonaparte (1991), Chatterjee and Rudra (1996), Sampson et al. (1996), Loyal et al. (1996), Sahni (1997), Rowe et al. (1997), Novas (1997), Sampson et al. (1998), Prasad and Sahni (1999), Knoll et al. (1999), Mohabey (2001), Tykoski and Rowe (2004), Novas et al. (2004), Smith (2007), Sampson and Witmer (2007), Carrano and Sampson (2008), Mohabey (2011), Prasad (2012), Gianechini et al. (2015) and Ratsinbaholison et al. (2016); to Majungasaurini by Delcourt (2018); and to Allosauridae by Huene (1933), Carroll (1988) and Khosla and Lucas (2023).