Yailin Mejia, 18, was reported missing after she was last seen on October 25, 2025, in the Boston–Cambridge area of Massachusetts. Public alerts describe her as a Hispanic female with brown hair and brown eyes and place her last known location variously in Boston and in Cambridge, suggesting the case is centered on Greater Boston but that exact movements before and after she was last seen remain unclear.

The National Center for Missing & Exploited Children and a Stop Child Abuse repost both list her missing date as October 25, 2025, and emphasize that she may still be in the local area or could have traveled to Boston. Authorities ask anyone with information to contact NCMEC at 1-800-THE-LOST or the Cambridge Police Department at 1-617-349-3300.

Very little public detail has been released about what Yailin was doing before she disappeared, who last saw her, or what she was wearing. If anyone in the Boston–Cambridge area saw Yailin or has information about her whereabouts, please contact the listed numbers.