Lake Mercer may refer to:

• Grand Lake in Grand Lake St. Marys State Park, Mercer county
• Mercer Lake in Mercer County Park, New Jersey
• Mercer Lake (Antarctica), a subglacial lake in Antarctica

• Mud and Sand
• Mudane
• Mudania
• Mudan Incident
• Mudanjiang Hailang International Airport
• Mudan, Pingtung
• Mudan River
• Mudansha
• Mudan Ting
• Mudanya
• Mudanza y Acarreo
• Mudapilavu
• Mudar
• Mudarabah
• Muda River
• Mudarra
• Mudashiru Lawal
• Mudassar Bukhari
• Mudassar Nazar
• Muda Tower
• Muda (tower)
• Mudava
• Mudavița Seacă River
• Mudawad
• Mudawana