Keith Nelson

• Keith Nelson (basketball), American former basketball player
• Keith Nelson (footballer), New Zealand international footballer
• Keith Nelson (musician), producer and guitarist of Buckcherry
• Keith Nelson (rugby union), New Zealand rugby union player
• Keith A. Nelson, American chemist
• Keith Dwayne Nelson, American convicted child murderer
• Keith Nelson, a fictional character played by Eric Stoltz in the film ''Some Kind of Wonderful''