Transatlantic is a multinational progressive rock supergroup consisting of Neal Morse, Roine Stolt, Pete Trewavas and Mike Portnoy. They formed in 1999 as a side project to their full-time bands, but disbanded in 2002. They then reunited in 2009.

Neal Morse is an American singer, musician and composer based in Nashville, Tennessee. In 1992, he formed the progressive rock band Spock's Beard with his brother Alan and released an album which was moderately successful. In 1999, he joined Dream Theater's co-founder and then drummer Mike Portnoy, together with Flower Kings' Roine Stolt and Marillion's Pete Trewavas they formed the super-group Transatlantic. In 2002, Neal Morse became a born again Christian, left Spock's Beard and began a Christian rock solo career, releasing many progressive rock concept albums about his new religious faith. In the meantime, he continued to play with Transatlantic and formed three new bands with Portnoy, Yellow Matter Custard, Flying Colors and The Neal Morse Band.