SDY
| Acronym | Definition |
|---|---|
| SDY | Schenectady (Amtrak station code; Schenectady, NY) |
| SDY | Sequential Data Set System Printer |
| SDY | Sidney, MT, USA (Airport Code) |
| SDY | Starter Deck Yugi (Yu-Gi-Oh cards) |
| SDY | South Dekalb YMCA (Decatur, GA) |
| SDY | Sequential Day of the Year (date format) |