Euhelopus was named by Romer (1956).

It was assigned to Astrodontidae by Huene (1959); to Brachiosauridae by Tatarinov (1964); to Titanosauridae by Young (1965); to Mamenchisauridae by He et al. (1988); to Camarasaurinae by McIntosh (1990); to Camarasauridae by Rozhdestvensky (1977), Rich et al. (1983), Sanz (1986), McIntosh (1990), Mcintosh et al. (1992), McIntosh (1997); to Euhelopidae by Dong (1998); to Euhelopodinae by Romer (1956), Steel (1970), Swinton (1970), Coombs and Molnar (1981), Dong et al. (1983), Dong (1990), Dong (1992), Martin-Rolland (1999); to Eusauropoda by Upchurch et al. (2004); to Titanosauriformes by Curry Rogers (2005), Barrett and Wang (2007), Amiot et al. (2010), Sekiya (2011), Mannion and Calvo (2011); to Somphospondyli by Sereno (1998), Wilson and Sereno (1998), Sereno (1999), Wilson (2002), You et al. (2004), Allain and Aquesbi (2008), Wilson and Upchurch (2009), González Riga et al. (2009), Suteethorn et al. (2010), Ksepka and Norell (2010), Zaher et al. (2011), D'Emic (2013), Mocho et al. (2014), Xing et al. (2015); to Camarasauromorpha by Carballido et al. (2011), Carballido et al. (2015); to Euhelopodidae by Carroll (1988), Upchurch (1995), Upchurch (1995), Buffetaut et al. (1995), Hunt et al. (1995), Buffetaut et al. (1997), Upchurch (1997), Buffetaut et al. (2002), Barrett et al. (2002), Royo-Torres et al. (2006), Buffetaut et al. (2006), Lü et al. (2006), Maisch and Matzke (2019), Poropat et al. (2020); and to Euhelopodidae by D'Emic (2012), Mannion et al. (2013), Mannion et al. (2019), Moore et al. (2023).