diff --git a/CHANGELOG.md b/CHANGELOG.md
index 127b621..8db9430 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -11,6 +11,7 @@ adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 ### Added
 
 - Add method `Query.results` for returning results as an iterator instead of sequence ([#37](https://github.com/nasa/python_cmr/issues/37))
+- Support searching by multiple platforms for collections and granules ([#80](https://github.com/nasa/python_cmr/issues/80))
 
 ### Changed
 
diff --git a/cmr/queries.py b/cmr/queries.py
index 1cf0f69..3e4a1f9 100644
--- a/cmr/queries.py
+++ b/cmr/queries.py
@@ -781,18 +781,21 @@ def entry_title(self, entry_title: str) -> Self:
 
         return self
 
-    def platform(self, platform: str) -> Self:
+    def platform(self, platform: Union[str, Sequence[str]]) -> Self:
         """
         Filter by the satellite platform the granule came from.
 
-        :param platform: name of the satellite
+        :param platform: name of the satellite (single string) or sequence of satellite names
         :returns: self
         """
 
         if not platform:
             raise ValueError("Please provide a value for platform")
 
-        self.params['platform'] = platform
+        self.params['platform'] = (
+            platform if isinstance(platform, str) else list(platform)
+        )
+
         return self
 
 
diff --git a/tests/test_collection.py b/tests/test_collection.py
index 2c2d866..2edeb4f 100644
--- a/tests/test_collection.py
+++ b/tests/test_collection.py
@@ -144,12 +144,26 @@ def test_platform(self):
         self.assertIn("platform", query.params)
         self.assertEqual(query.params["platform"], "1B")
 
+    def test_multiple_platforms(self):
+        query = CollectionQuery()
+
+        query.platform(["Terra", "Aqua"])
+
+        self.assertIn("platform", query.params)
+        self.assertEqual(query.params["platform"], ["Terra", "Aqua"])
+
     def test_empty_platform(self):
         query = CollectionQuery()
 
         with self.assertRaises(ValueError):
             query.platform(None)  # type: ignore[arg-type]
 
+    def test_empty_platform_list(self):
+        query = CollectionQuery()
+
+        with self.assertRaises(ValueError):
+            query.platform([])
+
     def test_revision_date(self):
         query = CollectionQuery()
         collections = query.short_name("SWOT_L2_HR_RiverSP_reach_2.0").revision_date("2022-05-16", "2024-06-30").get_all()
diff --git a/tests/test_granule.py b/tests/test_granule.py
index fbf188f..d14b319 100644
--- a/tests/test_granule.py
+++ b/tests/test_granule.py
@@ -344,6 +344,14 @@ def test_platform(self):
         self.assertIn(self.platform, query.params)
         self.assertEqual(query.params[self.platform], "1B")
 
+    def test_multiple_platforms(self):
+        query = GranuleQuery()
+
+        query.platform(["Terra", "Aqua"])
+
+        self.assertIn(self.platform, query.params)
+        self.assertEqual(query.params[self.platform], ["Terra", "Aqua"])
+
     def test_sort_key(self):
         query = GranuleQuery()
         # Various sort keys using this as an example
@@ -363,6 +371,12 @@ def test_empty_platform(self):
         with self.assertRaises(ValueError):
             query.platform(None)  # type: ignore[arg-type]
 
+    def test_empty_platform_list(self):
+        query = GranuleQuery()
+
+        with self.assertRaises(ValueError):
+            query.platform([])
+
     def test_granule_ur(self):
         query = GranuleQuery()