Bernard John "Bernie" Marsden (born 7 May 1951) is an English rock and blues guitarist. He is primarily known for his work with Whitesnake having written or co-written with David Coverdale many of the group's hit songs, such as "Here I Go Again".
Having played with Glenn Cornick's Wild Turkey in 1974, he then played with Babe Ruth, from 1975–76, before becoming an original member of Paice Ashton Lord in 1977 and then joining the hard rock band, Whitesnake, after having the possibility of playing with his boy-time hero Paul McCartney and Wings because while waiting, David Coverdale asked him to form Whitesnake.
In more recent years, Marsden has toured with his bands Company of Snakes, M3 (both formed with fellow former Whitesnake members Micky Moody and Neil Murray), and performed with Elkie Brooks.
Over the years he has taken part in a number of sessions and has released a handful of solo albums (And About Time, Too!, Look at Me Now, Green & Blues, Stacks). He has also collaborated with Micky Moody on a number of Marsden-Moody live and studio projects.