Full forms list starting with Y
| Acronym | Full Form |
| Y2K | Year 2000 |
| YAC | Yeast Artificial Chromosome |
| YAHOO | Yet Another Hierarchical Officious Oracle |
| Yamaha | named after its founder, Torakusu Yamaha |
| YASH | Yamaha Artist Services Hollywood |
| YCCE | Yeshwantrao Chavan College of Engineering |
| YCLT | Yavatmal College for Leadership Training |
| YCMOU | Yashwantrao Chavan Maharashtra Open University |
| yd | Yard |
| YFC | Youth For Christ |
| YHWH | Yahweh |
| YKK | Yoshida Kogyo Kabushikikaisha |
| YKK | Yokohama Kaidashi Kikou |
| YMBC | Yeldo Mar Baselios College |
| YMBC | York Model Boat Club |
| YMCA | Young Men's Christian Association |
| YNAB | You Need a Budget |
| YOLO | You Only Live Once |
| YONO | You Only Need One |
| YOUCAT | Youth Catechism of the Catholic Church |
| YouTube | You + Tube |
| YoY | Year over Year |
| YOY | Yeshivat Ohr Yerushalayim |
| YP | Yellow Pages |
| YP | Yorkshire Post |
| YRC | Yellow Roadway Corporation |
| YRC | Yokohama Rubber Company |
| YRC | York Railway |
| YRC | Youth Red Cross |
| YRF | Yash Raj Films |
| YRF | Cartwright Airport |
| YRF | Youth Renewal Fund |
| YSRCP | యువజన శ్రామిక రైతు కాంగ్రెస్ పార్టీ |
| YT | YouTube |
| YT | Yukon |
| YT | Mayotte |
| yt | Mayotte (TLD) |
| yt | you there |
| YT | Yorkshire Terrier |
| YT | Yellowtail |
| YT | Yottatesla |
| YT | Yevat railway station |
| YT | Air Togo |
| YTD | Year To Date |
| YTD | YouTube Downloader |
| Ytd | Yesterday |
| YTD | Thicket Portage Airport |
| YUVA | Youth Unite for Victory on AIDS |
| YWCA | Young Women’s Christian Association |
Full forms list starting with Z
