IWS may refer to:

• West Houston Airport (IATA code)
• Integrated Workstation, developed by Convergent Technologies (Unisys)
• International Wrestling Syndicate
• In-water survey, a method of surveying the underwater parts of a floating ship
• Irish Water Spaniel
• Steyr IWS 2000, an Austrian semi-automatic rifle
• International Wool Secretariat

• Cave swiftlet
• Cave Township, Franklin County, Illinois
• Cave troll
• Cavetto
• Cave, West Virginia
• Cave weta
• Cave Without a Name
• Cave, WV
• Cavezzo
• Cav Hat
• CAV hat
• Cavia
• Cavia anolaimae
• Cavia aperea
• Cavia cobaya
• Cavia (company)
• Cavia cutleri
• Cavia fulgida
• Cavia guianae
• Cavia intermedia
• Cavia leucopyga
• Cavia longipilis
• Cavia magna
• Caviano
• Caviano, Switzerland