K103 may refer to:

• HMCS Alberni (K103), a Canadian Royal Navy corvette
• KKCW, the radio station "K103" broadcasting in Portland, Oregon
• CKRK-FM, the radio station "K103" broadcasting in Kahnawake, Quebec

• Cockman Road
• Cockman, Thomas
• CocknBullKid
• Cockney alphabet
• Cockney dialect
• Cockney music
• Cock of the Roost
• Cock of the Walk
• Cock O' the North
• Cock o' the North (greyhounds)
• Cock o' the Walk (1953 film)
• Cockpen, Midlothian
• Cockpit (2017 film)
• Cock pit (disambiguation)
• Cockpit (film)
• Cockpit instrumentation
• Cockpit USA
• Cock (play)
• Cock pump
• Cockrell, Missouri
• Cockrell Township, Chariton County, Missouri
• Cock, Richard
• Cockroach (2010 film)
• Cockroach-berry
• Cockroach Cay