TKW may indicate:

• Total known weight
• Tekin Airport {{airport codes|TKW}}

• HMS Oceanway
• HMS Oceanway (F143)
• HMS Ockham
• HMS Octavia
• HMS Odiham
• HMS Odzani
• HMS Odzani (K356)
• HMS Ogre
• HMS Oiseau
• HMS Old James
• HMS Olive Branch
• HMS Olympia
• HMS Olympia (1806)
• HMS Olympic
• HMS Olympus
• HMS Onslow (1916)
• HMS Ontario
• HMS Ontario (1780)
• HMS Opal (1875)
• HMS Ophelia
• HMS Opossum
• HMS Opportune
• HMS Opportune (G80)
• HMS Oracle
• HMS Orby