diff --git a/slack-lint-checks/src/main/java/slack/lint/denylistedapis/DenyListedApiDetector.kt b/slack-lint-checks/src/main/java/slack/lint/denylistedapis/DenyListedApiDetector.kt
index fb0c0ac1..d098225d 100644
--- a/slack-lint-checks/src/main/java/slack/lint/denylistedapis/DenyListedApiDetector.kt
+++ b/slack-lint-checks/src/main/java/slack/lint/denylistedapis/DenyListedApiDetector.kt
@@ -28,6 +28,7 @@ import com.android.tools.lint.detector.api.XmlScanner
 import com.intellij.psi.PsiField
 import com.intellij.psi.PsiMethod
 import java.util.EnumSet
+import java.util.ServiceLoader
 import org.jetbrains.uast.UCallExpression
 import org.jetbrains.uast.UElement
 import org.jetbrains.uast.UExpression
@@ -54,7 +55,7 @@ internal class DenyListedApiDetector : Detector(), SourceCodeScanner, XmlScanner
   override fun visitElement(context: XmlContext, element: Element) =
     CONFIG.visitor(context, element)
 
-  private class DenyListConfig(vararg entries: DenyListedEntry) {
+  private class DenyListConfig(entries: Set<DenyListedEntry>) {
     private class TypeConfig(entries: List<DenyListedEntry>) {
       @Suppress("UNCHECKED_CAST") // Safe because of filter call.
       val functionEntries =
@@ -213,8 +214,8 @@ internal class DenyListedApiDetector : Detector(), SourceCodeScanner, XmlScanner
     val DEFAULT_ISSUE = createIssue("DenyListedApi")
     val BLOCKING_ISSUE = createIssue("DenyListedBlockingApi")
 
-    private val CONFIG =
-      DenyListConfig(
+    private val ENTRIES =
+      setOf(
         DenyListedEntry(
           className = "io.reactivex.rxjava3.core.Observable",
           functionName = "hide",
@@ -466,6 +467,10 @@ internal class DenyListedApiDetector : Detector(), SourceCodeScanner, XmlScanner
         *rxJavaBlockingCalls().toTypedArray(),
       )
 
+    private val EXTERNAL_ENTRIES = loadExternalEntries()
+
+    private val CONFIG = DenyListConfig(ENTRIES + EXTERNAL_ENTRIES)
+
     val ISSUES = CONFIG.issues
 
     private fun createIssue(
@@ -491,6 +496,14 @@ internal class DenyListedApiDetector : Detector(), SourceCodeScanner, XmlScanner
           ),
       )
     }
+
+    private fun loadExternalEntries(): Set<DenyListedEntry> {
+      val loader = ServiceLoader.load(DenyListedEntryLoader::class.java)
+
+      return mutableSetOf<DenyListedEntry>().apply {
+        loader.iterator().forEachRemaining { addAll(it.entries) }
+      }
+    }
   }
 }
 
diff --git a/slack-lint-checks/src/main/java/slack/lint/denylistedapis/DenyListedEntryLoader.kt b/slack-lint-checks/src/main/java/slack/lint/denylistedapis/DenyListedEntryLoader.kt
new file mode 100644
index 00000000..9dacf202
--- /dev/null
+++ b/slack-lint-checks/src/main/java/slack/lint/denylistedapis/DenyListedEntryLoader.kt
@@ -0,0 +1,5 @@
+package slack.lint.denylistedapis
+
+interface DenyListedEntryLoader {
+  val entries: Set<DenyListedEntry>
+}
diff --git a/slack-lint-checks/src/test/java/slack/lint/denylistedapis/DenyListedApiDetectorTest.kt b/slack-lint-checks/src/test/java/slack/lint/denylistedapis/DenyListedApiDetectorTest.kt
index 0647b879..7b52fe7e 100644
--- a/slack-lint-checks/src/test/java/slack/lint/denylistedapis/DenyListedApiDetectorTest.kt
+++ b/slack-lint-checks/src/test/java/slack/lint/denylistedapis/DenyListedApiDetectorTest.kt
@@ -700,6 +700,38 @@ class DenyListedApiDetectorTest : BaseSlackLintTest() {
       )
   }
 
+  @Test
+  fun externalDenylistEntries() {
+    lint()
+      .files(
+        EXTERNAL_ENTRY_TESTCLASS_STUB,
+        kotlin(
+          """
+          package foo
+
+          import slack.lint.TestClass
+
+          class SomeClass {
+            fun test() {
+              TestClass.run()
+            }
+          }
+          """
+        )
+          .indented()
+      )
+      .run()
+      .expect(
+        """
+        src/foo/SomeClass.kt:7: Error: TestClass.run() is disallowed in tests via external denylist entry. [DenyListedApi]
+            TestClass.run()
+                      ~~~
+        1 errors, 0 warnings
+        """
+          .trimIndent()
+      )
+  }
+
   companion object {
     private val FLOWABLE_STUB =
       java(
@@ -1026,5 +1058,16 @@ class DenyListedApiDetectorTest : BaseSlackLintTest() {
       """
         )
         .indented()
+
+    private val EXTERNAL_ENTRY_TESTCLASS_STUB =
+      kotlin(
+        """
+          package slack.lint
+
+          object TestClass {
+            fun run() {}
+          }
+        """.trimIndent()
+      )
   }
 }
diff --git a/slack-lint-checks/src/test/java/slack/lint/denylistedapis/TestEntriesLoader.kt b/slack-lint-checks/src/test/java/slack/lint/denylistedapis/TestEntriesLoader.kt
new file mode 100644
index 00000000..1ebdb902
--- /dev/null
+++ b/slack-lint-checks/src/test/java/slack/lint/denylistedapis/TestEntriesLoader.kt
@@ -0,0 +1,12 @@
+package slack.lint.denylistedapis
+
+internal class TestEntriesLoader: DenyListedEntryLoader {
+  override val entries: Set<DenyListedEntry> =
+    setOf(
+      DenyListedEntry(
+        className = "slack.lint.TestClass",
+        functionName = "run",
+        errorMessage = "TestClass.run() is disallowed in tests via external denylist entry."
+      )
+    )
+}
\ No newline at end of file
diff --git a/slack-lint-checks/src/test/resources/META-INF/services/slack.lint.denylistedapis.DenyListedEntryLoader b/slack-lint-checks/src/test/resources/META-INF/services/slack.lint.denylistedapis.DenyListedEntryLoader
new file mode 100644
index 00000000..9bf5de9e
--- /dev/null
+++ b/slack-lint-checks/src/test/resources/META-INF/services/slack.lint.denylistedapis.DenyListedEntryLoader
@@ -0,0 +1 @@
+slack.lint.denylistedapis.TestEntriesLoader
\ No newline at end of file