By the Sad Sea Waves
- Joer: 1917
- Land: United States of America
- Genre: Comedy
- Studio: Rolin Films
- Schlësselwuert: rescue from drowning, silent film
- Direkter: Alfred J. Goulding
- Besetzung: Harold Lloyd, Harry 'Snub' Pollard, Bebe Daniels, Frank Alexander, William Blaisdell, Sammy Brooks