"Oh I Want to Know You More" (Wayne Kirkpatrick, Billy Sprague)
"Oh Savannah" (WK, David Williams, William Austin,
"Old Enough to Know" (Michael W. Smith, WK)
Recorded by Michael W. Smith on The Big Picture, The First Decade
"On the Other Side" (Michael W. Smith, WK)
Recorded by Michael W. Smith on i 2 (eye)
"One" (Gordon Kennedy, WK)
"One in a Million" (Katrina Elam, Josh Leo, WK)
"Only A Matter of Time" (WK)
"Only Make Believe" (WK)
"The Other Side of Me" (Trilogy One) (Michael W. Smith, Wayne WK)
Recorded by Michael W. Smith on I'll Lead You Home
"Other Side of Midnight" (Chris Harris, Aaron Neville, WK)
"Our Love's Like That" (Jim Collins, WK)
"Out of my Head" (WK, Jennifer Hanson, William Austin)
"Out of my Heart" (WK, Philip Madeira, Gordon Kennedy)