Seltzer is carbonated water.

• Hard seltzer, alcoholic drink

Seltzer may also refer to:

• Seltzer (surname)
• Seltzer, Pennsylvania, a census-designated place in Schuylkill County, Pennsylvania, United States

• Alka-Seltzer
• Bromo-Seltzer
• Selters (Lahn), a village in Germany known for its natural mineral springs
• Seltzer bottle
• Selzer
• Setzer