diff --git a/src/app/record/components/work-external-identifiers-edit/work-external-identifiers-edit.component.html b/src/app/record/components/work-external-identifiers-edit/work-external-identifiers-edit.component.html
index 37e48a5332..6a9bebaa27 100644
--- a/src/app/record/components/work-external-identifiers-edit/work-external-identifiers-edit.component.html
+++ b/src/app/record/components/work-external-identifiers-edit/work-external-identifiers-edit.component.html
@@ -253,8 +253,8 @@
       i18n="@@works.onlyIdentifierTypesFundedBy"
       *ngIf="externalIdForm.hasError('funded_by_invalid')"
     >
-      Only identifier types "grant number", "doi", "uri" or "proposal id" are
-      allowed when using "funded-by" identifiers</mat-error
+      Only identifier types "grant number", "doi", "RRID", "uri" or "proposal
+      id" are allowed when using "funded-by" identifiers</mat-error
     >
 
     <mat-error
diff --git a/src/app/shared/validators/work-identifiers/work-identifiers.validator.spec.ts b/src/app/shared/validators/work-identifiers/work-identifiers.validator.spec.ts
new file mode 100644
index 0000000000..f733649eb7
--- /dev/null
+++ b/src/app/shared/validators/work-identifiers/work-identifiers.validator.spec.ts
@@ -0,0 +1,49 @@
+import { UntypedFormBuilder, UntypedFormGroup } from '@angular/forms'
+
+import { WorkIdentifiers } from './work-identifiers.validator'
+import { WorkRelationships } from '../../../types/works.endpoint'
+
+describe('WorkIdentifiers.fundedByInvalidRelationship', () => {
+  let formBuilder: UntypedFormBuilder
+
+  beforeEach(() => {
+    formBuilder = new UntypedFormBuilder()
+  })
+
+  function buildForm(
+    externalIdentifierType: string,
+    externalRelationship: string
+  ): UntypedFormGroup {
+    const form = formBuilder.group({
+      externalIdentifierType: [externalIdentifierType],
+      externalRelationship: [externalRelationship],
+    })
+    form.setValidators([WorkIdentifiers.fundedByInvalidRelationship()])
+    form.updateValueAndValidity()
+    return form
+  }
+
+  it('allows rrid identifiers on a funded-by relationship', () => {
+    const form = buildForm('rrid', WorkRelationships['funded-by'])
+    expect(form.hasError('funded_by_invalid')).toBeFalse()
+  })
+
+  it('allows the previously supported identifier types on a funded-by relationship', () => {
+    ;['grant_number', 'doi', 'uri', 'proposal-id'].forEach((type) => {
+      const form = buildForm(type, WorkRelationships['funded-by'])
+      expect(form.hasError('funded_by_invalid')).toBeFalse()
+    })
+  })
+
+  it('rejects unsupported identifier types on a funded-by relationship', () => {
+    ;['isbn', 'handle', 'other-id', 'source-work-id'].forEach((type) => {
+      const form = buildForm(type, WorkRelationships['funded-by'])
+      expect(form.hasError('funded_by_invalid')).toBeTrue()
+    })
+  })
+
+  it('does not restrict identifier types on other relationships', () => {
+    const form = buildForm('isbn', WorkRelationships.self)
+    expect(form.hasError('funded_by_invalid')).toBeFalse()
+  })
+})
diff --git a/src/app/shared/validators/work-identifiers/work-identifiers.validator.ts b/src/app/shared/validators/work-identifiers/work-identifiers.validator.ts
index 1f90fa0019..23af9f402d 100644
--- a/src/app/shared/validators/work-identifiers/work-identifiers.validator.ts
+++ b/src/app/shared/validators/work-identifiers/work-identifiers.validator.ts
@@ -5,7 +5,7 @@ export class WorkIdentifiers {
     return (c: AbstractControl): { [key: string]: boolean } | null => {
       if (c.get('externalRelationship')?.value === 'funded-by') {
         if (
-          ['grant_number', 'doi', 'uri', 'proposal-id'].indexOf(
+          ['grant_number', 'doi', 'uri', 'proposal-id', 'rrid'].indexOf(
             c.get('externalIdentifierType')?.value
           ) >= 0
         ) {
diff --git a/src/locale/messages.source.xlf b/src/locale/messages.source.xlf
index 92e055a87e..8593917f47 100644
--- a/src/locale/messages.source.xlf
+++ b/src/locale/messages.source.xlf
@@ -14327,7 +14327,7 @@
         </context-group>
       </trans-unit>
       <trans-unit id="works.onlyIdentifierTypesFundedBy" datatype="html" resname="works.onlyIdentifierTypesFundedBy">
-        <source>Only identifier types "grant number", "doi", "uri" or "proposal id" are allowed when using "funded-by" identifiers</source>
+        <source>Only identifier types "grant number", "doi", "RRID", "uri" or "proposal id" are allowed when using "funded-by" identifiers</source>
         <target>works.onlyIdentifierTypesFundedBy</target>
         <context-group purpose="location">
           <context context-type="sourcefile">src/app/record/components/work-external-identifiers-edit/work-external-identifiers-edit.component.html</context>
diff --git a/src/locale/messages.xlf b/src/locale/messages.xlf
index 337d12fbbb..0ec7740d6f 100644
--- a/src/locale/messages.xlf
+++ b/src/locale/messages.xlf
@@ -13562,7 +13562,7 @@
         </context-group>
       </trans-unit>
       <trans-unit id="works.onlyIdentifierTypesFundedBy" datatype="html" resname="works.onlyIdentifierTypesFundedBy">
-        <source>Only identifier types "grant number", "doi", "uri" or "proposal id" are allowed when using "funded-by" identifiers</source>
+        <source>Only identifier types "grant number", "doi", "RRID", "uri" or "proposal id" are allowed when using "funded-by" identifiers</source>
         <context-group purpose="location">
           <context context-type="sourcefile">src/app/record/components/work-external-identifiers-edit/work-external-identifiers-edit.component.html</context>
           <context context-type="linenumber">255,257</context>
diff --git a/src/locale/properties/works/works.en.properties b/src/locale/properties/works/works.en.properties
index b5e983d119..cca64c5629 100644
--- a/src/locale/properties/works/works.en.properties
+++ b/src/locale/properties/works/works.en.properties
@@ -142,7 +142,7 @@ works.addPubmed=Add PubMed ID
 works.addBibtex=Add BibTeX
 works.worksToExport=works to export
 works.pleaseEnterExternalID=Please enter an external ID
-works.onlyIdentifierTypesFundedBy=Only identifier types "grant number", "doi", "uri" or "proposal id" are allowed when using "funded-by" identifiers
+works.onlyIdentifierTypesFundedBy=Only identifier types "grant number", "doi", "RRID", "uri" or "proposal id" are allowed when using "funded-by" identifiers
 works.publisher=Publisher
 works.conferenceTitle=Conference title
 works.bookTitle=Book title