WKTU
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| Broadcast area | New York metropolitan area | 
| Frequency | 103.5 MHz (HD Radio) | 
| Branding | 103.5 KTU | 
| Programming | |
| Language | English | 
| Format | Rhythmic adult contemporary | 
| Subchannels | 
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| Affiliations | |
| Ownership | |
| Owner | 
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| History | |
| First air date | September 1, 1958 | 
| Former call signs | 
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| Technical information | |
| Licensing authority | FCC | 
| Facility ID | 6595 | 
| Class | B | 
| ERP | 
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| HAAT | 415 meters (1,362 ft) | 
| Transmitter coordinates | 40°44′54″N 73°59′08″W / 40.748444°N 73.985694°W | 
| Links | |
| Public license information  | |
| Webcast | 
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| Website | |
WKTU (103.5 FM) is a rhythmic adult contemporary formatted radio station licensed to Lake Success, New York, a suburb of New York City. WKTU is owned by iHeartMedia and broadcasts from studios at 125 West 55th Street in Midtown Manhattan; its transmitter is located at the Empire State Building.