The Blue Envelope Mystery
- Xyoo: 1916
- Ncig Teb Chaws: United States of America
- Genre: Drama
- Studio: Vitagraph Company of America
- Cov ntsiab lus:
- Tus Thawj Coj: Wilfrid North
- Pov Pob Tseg: Lillian Walker, John Drew Bennett, Bob Hay, Charles Kent, Josephine Earle, Harry Northrup