Mud minnow may refer to:

• Galaxiella munda, known as Western mud minnow
• Lepidogalaxias salamandroides, common name Shannon mudminnow
• species of fish of the family Umbridae
  • Central mudminnow
  • Eastern mudminnow
  • European mudminnow
• Mummichog (Fundulus heteroclitus), or mud minnows, a small killifish