KATY may refer to:

• Katy, Texas
• KATY-FM, a radio station (101.3 FM) licensed to Idyllwild, California, United States
• Watertown Regional Airport (ICAO code KATY)
• Missouri-Kansas-Texas Railroad, defunct railroad popularly known as "the Katy"

• Trachydora porphyrescens
• Trachydora psammodes
• Trachydora stephanopa
• Trachydora tephronota
• Trachydora thyrsophora
• Trachydora zophopepla
• Trachydrillia
• Trachykele
• Trachylepis acutilabris
• Trachylepis affinis
• Trachylepis lacertiformis
• Trachyliopus
• Trachyliopus affinis
• Trachyliopus albosignata
• Trachyliopus androyensis
• Trachyliopus annulicornis
• Trachyliopus fairmairei
• Trachyliopus forticornis
• Trachyliopus fulvosparsus
• Trachyliopus fuscosignatus
• Trachyliopus minor
• Trachyliopus multifasciculatus
• Trachyliopus pauliani
• Trachyliopus subannulicornis
• Trachylobium