diff --git a/CHANGES.rst b/CHANGES.rst
index a1080490..e6794d02 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -5,6 +5,8 @@ A0.18.1 (unreleased)
 
 - Remove the unused ``variance-1.0.0`` schema. [#344]
 
+- Add wcs tag to wfi_image and wfi_mosaic schemas. [#351]
+
 0.18.0 (2023-11-06)
 -------------------
 
diff --git a/src/rad/resources/schemas/wfi_image-1.0.0.yaml b/src/rad/resources/schemas/wfi_image-1.0.0.yaml
index 65a1be47..7b8b11bb 100644
--- a/src/rad/resources/schemas/wfi_image-1.0.0.yaml
+++ b/src/rad/resources/schemas/wfi_image-1.0.0.yaml
@@ -16,11 +16,16 @@ properties:
       - $ref: common-1.0.0
       - type: object
         properties:
+          wcs:
+            title: WCS object
+            anyOf:
+              - tag: tag:stsci.edu:gwcs/wcs-*
+              - type: "null"
           photometry:
             tag: asdf://stsci.edu/datamodels/roman/tags/photometry-1.0.0
           source_detection:
             tag: asdf://stsci.edu/datamodels/roman/tags/source_detection-1.0.0
-        required: [photometry]
+        required: [photometry, wcs]
   data:
     title: Science data, excluding border reference pixels.
     tag: tag:stsci.edu:asdf/unit/quantity-1.1.0
diff --git a/src/rad/resources/schemas/wfi_mosaic-1.0.0.yaml b/src/rad/resources/schemas/wfi_mosaic-1.0.0.yaml
index 1f17e93a..13bd2474 100644
--- a/src/rad/resources/schemas/wfi_mosaic-1.0.0.yaml
+++ b/src/rad/resources/schemas/wfi_mosaic-1.0.0.yaml
@@ -29,7 +29,12 @@ properties:
             tag: asdf://stsci.edu/datamodels/roman/tags/resample-1.0.0
           wcsinfo:
             tag: asdf://stsci.edu/datamodels/roman/tags/mosaic_wcsinfo-1.0.0
-        required: [filename, basic, individual_image_meta, program, resample, wcsinfo]
+          wcs:
+            title: WCS object
+            anyOf:
+              - tag: tag:stsci.edu:gwcs/wcs-*
+              - type: "null"
+        required: [basic, individual_image_meta, photometry, program, resample, wcs, wcsinfo]
   data:
     title: Science data, excluding border reference pixels.
     tag: tag:stsci.edu:asdf/unit/quantity-1.1.0
diff --git a/tests/test_schemas.py b/tests/test_schemas.py
index dcacd034..19216c23 100644
--- a/tests/test_schemas.py
+++ b/tests/test_schemas.py
@@ -51,6 +51,10 @@ def valid_tag_uris(manifest):
             "tag:stsci.edu:asdf/unit/quantity-1.1.0",
             "tag:stsci.edu:asdf/unit/unit-1.0.0",
             "tag:astropy.org:astropy/units/unit-1.0.0",
+            "tag:stsci.edu:gwcs/wcs-1.0.0",
+            "tag:stsci.edu:gwcs/wcs-1.1.0",
+            "tag:stsci.edu:gwcs/wcs-1.2.0",
+            "tag:stsci.edu:gwcs/wcs-*",
         ]
     )
     return uris