Marsh rat can refer to several not closely related types of semiaquatic rodents of superfamily Muroidea:

• Dasymys, about ten species from Africa in the family Muridae;
  • African marsh rat or common dasymys (D. incomtus)
  • Angolan marsh rat (D. nudipes)
• Holochilus, three species from South America in the family Cricetidae;
  • Amazonian marsh rat, common marsh rat or simply the marsh rat (H. sciureus)
  • Brazilian marsh rat or web-footed marsh rat (H. brasiliensis)
  • Chacoan marsh rat (H. chacarius)
• Greater marsh rat (Lundomys molitor), a cricetid from southeastern South America;
• Marsh rice rat (Oryzomys palustris), a cricetid from southeastern North America.

This disambiguation page lists articles associated with the title Marsh rat.
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