diff --git a/src/main/java/com/google/devtools/build/lib/analysis/PackageSpecificationProvider.java b/src/main/java/com/google/devtools/build/lib/analysis/PackageSpecificationProvider.java
index a6ce95562ae2a0..72b778ad2803f3 100644
--- a/src/main/java/com/google/devtools/build/lib/analysis/PackageSpecificationProvider.java
+++ b/src/main/java/com/google/devtools/build/lib/analysis/PackageSpecificationProvider.java
@@ -15,6 +15,7 @@
 package com.google.devtools.build.lib.analysis;
 
 import com.google.devtools.build.lib.cmdline.Label;
+import com.google.devtools.build.lib.cmdline.LabelSyntaxException;
 import com.google.devtools.build.lib.collect.nestedset.NestedSet;
 import com.google.devtools.build.lib.collect.nestedset.NestedSetBuilder;
 import com.google.devtools.build.lib.collect.nestedset.Order;
@@ -26,6 +27,8 @@
 import com.google.devtools.build.lib.packages.Provider;
 import com.google.devtools.build.lib.starlarkbuildapi.PackageSpecificationProviderApi;
 import java.util.Optional;
+import net.starlark.java.eval.EvalException;
+import net.starlark.java.eval.Starlark;
 
 /**
  * A {@link TransitiveInfoProvider} that describes a set of transitive package specifications used
@@ -92,4 +95,19 @@ private static NestedSet<PackageGroupContents> getPackageSpecifications(
     builder.add(packageGroup.getPackageSpecifications());
     return builder.build();
   }
+
+  @Override
+  public boolean targetInAllowlist(Object target) throws EvalException, LabelSyntaxException {
+    Label targetLabel;
+    if (target instanceof String) {
+      targetLabel = Label.parseCanonical((String) target);
+    } else if (target instanceof Label) {
+      targetLabel = (Label) target;
+    } else {
+      throw Starlark.errorf(
+          "expected string or label for 'target' instead of %s", Starlark.type(target));
+    }
+
+    return Allowlist.isAvailableFor(packageSpecifications, targetLabel);
+  }
 }
diff --git a/src/main/java/com/google/devtools/build/lib/starlarkbuildapi/PackageSpecificationProviderApi.java b/src/main/java/com/google/devtools/build/lib/starlarkbuildapi/PackageSpecificationProviderApi.java
index c313719dcbbd5c..c81eb49665d217 100644
--- a/src/main/java/com/google/devtools/build/lib/starlarkbuildapi/PackageSpecificationProviderApi.java
+++ b/src/main/java/com/google/devtools/build/lib/starlarkbuildapi/PackageSpecificationProviderApi.java
@@ -14,12 +14,30 @@
 package com.google.devtools.build.lib.starlarkbuildapi;
 
 import com.google.devtools.build.docgen.annot.DocCategory;
+import com.google.devtools.build.lib.cmdline.Label;
+import com.google.devtools.build.lib.cmdline.LabelSyntaxException;
 import com.google.devtools.build.lib.starlarkbuildapi.core.StructApi;
+import net.starlark.java.annot.Param;
+import net.starlark.java.annot.ParamType;
 import net.starlark.java.annot.StarlarkBuiltin;
+import net.starlark.java.annot.StarlarkMethod;
+import net.starlark.java.eval.EvalException;
 
 /** Provider which describes a set of transitive package specifications used in package groups. */
 @StarlarkBuiltin(
     name = "PackageSpecificationInfo",
     doc = "Information about transitive package specifications used in package groups.",
     category = DocCategory.PROVIDER)
-public interface PackageSpecificationProviderApi extends StructApi {}
+public interface PackageSpecificationProviderApi extends StructApi {
+  @StarlarkMethod(
+      name = "contains",
+      doc = "Checks if a target exists in a package group.",
+      parameters = {
+        @Param(
+            name = "target",
+            positional = true,
+            doc = "A target which is checked if it exists inside the package group.",
+            allowedTypes = {@ParamType(type = Label.class), @ParamType(type = String.class)})
+      })
+  public boolean targetInAllowlist(Object target) throws EvalException, LabelSyntaxException;
+}
diff --git a/src/test/java/com/google/devtools/build/lib/analysis/allowlisting/AllowlistTest.java b/src/test/java/com/google/devtools/build/lib/analysis/allowlisting/AllowlistTest.java
index 828bbe7b343580..d65485406ee7ab 100644
--- a/src/test/java/com/google/devtools/build/lib/analysis/allowlisting/AllowlistTest.java
+++ b/src/test/java/com/google/devtools/build/lib/analysis/allowlisting/AllowlistTest.java
@@ -125,4 +125,156 @@ public void testIncludes() throws Exception {
     getConfiguredTarget("//x:x");
     assertNoEvents();
   }
+
+  @Test
+  public void targetInAllowlist_targetAsStringParameter() throws Exception {
+    scratch.file(
+        "allowlist/BUILD",
+        "package_group(",
+        "    name='allowlist',",
+        "    packages=[",
+        "        '//direct',",
+        "    ])");
+    scratch.file(
+        "test/rule.bzl",
+        "def _impl(ctx):",
+        "  target = '//direct:rule_from_allowlist'",
+        "  target_in_allowlist ="
+            + " ctx.attr._allowlist_test[PackageSpecificationInfo].contains(target)",
+        "  if not target_in_allowlist:",
+        "    fail('Target should be in the allowlist')",
+        "  return []",
+        "custom_rule = rule(",
+        "  implementation = _impl,",
+        "  attrs = {",
+        "    '_allowlist_test': attr.label(",
+        "      default = '//allowlist:allowlist',",
+        "      cfg = 'exec',",
+        "      providers = ['PackageSpecificationInfo']",
+        "    ),",
+        "  },",
+        ")");
+    scratch.file(
+        "test/BUILD",
+        "load('//test:rule.bzl', 'custom_rule')",
+        "custom_rule(name='allowlist_rule')");
+
+    getConfiguredTarget("//test:allowlist_rule");
+
+    assertNoEvents();
+  }
+
+  @Test
+  public void targetInAllowlist_targetAsLabelParameter() throws Exception {
+    scratch.file(
+        "allowlist/BUILD",
+        "package_group(",
+        "    name='allowlist',",
+        "    packages=[",
+        "        '//test',",
+        "    ])");
+    scratch.file(
+        "test/rule.bzl",
+        "def _impl(ctx):",
+        "  target = ctx.label",
+        "  target_in_allowlist ="
+            + " ctx.attr._allowlist_test[PackageSpecificationInfo].contains(target)",
+        "  if not target_in_allowlist:",
+        "    fail('Target should be in the allowlist')",
+        "  return []",
+        "custom_rule = rule(",
+        "  implementation = _impl,",
+        "  attrs = {",
+        "    '_allowlist_test': attr.label(",
+        "      default = '//allowlist:allowlist',",
+        "      cfg = 'exec',",
+        "      providers = [PackageSpecificationInfo]",
+        "    ),",
+        "  },",
+        ")");
+    scratch.file(
+        "test/BUILD",
+        "load('//test:rule.bzl', 'custom_rule')",
+        "custom_rule(name='allowlist_rule')");
+
+    getConfiguredTarget("//test:allowlist_rule");
+
+    assertNoEvents();
+  }
+
+  @Test
+  public void targetNotInAllowlist() throws Exception {
+    scratch.file(
+        "allowlist/BUILD",
+        "package_group(",
+        "    name='allowlist',",
+        "    packages=[",
+        "        '//direct',",
+        "    ])");
+    scratch.file(
+        "test/rule.bzl",
+        "def _impl(ctx):",
+        "  target = '//non_direct:rule_not_from_allowlist'",
+        "  target_in_allowlist ="
+            + " ctx.attr._allowlist_test[PackageSpecificationInfo].contains(target)",
+        "  if target_in_allowlist:",
+        "    fail('Target should not be in the allowlist')",
+        "  return []",
+        "custom_rule = rule(",
+        "  implementation = _impl,",
+        "  attrs = {",
+        "    '_allowlist_test': attr.label(",
+        "      default = '//allowlist:allowlist',",
+        "      cfg = 'exec',",
+        "      providers = [PackageSpecificationInfo]",
+        "    ),",
+        "  },",
+        ")");
+    scratch.file(
+        "test/BUILD",
+        "load('//test:rule.bzl', 'custom_rule')",
+        "custom_rule(name='allowlist_rule')");
+
+    getConfiguredTarget("//test:allowlist_rule");
+
+    assertNoEvents();
+  }
+
+  @Test
+  public void targetNotInAllowlist_negativePath() throws Exception {
+    scratch.file(
+        "allowlist/BUILD",
+        "package_group(",
+        "    name='allowlist',",
+        "    packages=[",
+        "        '-//direct',",
+        "    ])");
+    scratch.file(
+        "test/rule.bzl",
+        "def _impl(ctx):",
+        "  target = '//direct:rule_from_allowlist'",
+        "  target_in_allowlist ="
+            + " ctx.attr._allowlist_test[PackageSpecificationInfo].contains(target)",
+        "  if target_in_allowlist:",
+        "    fail('Target should not be in the allowlist (negative path)')",
+        "  return []",
+        "custom_rule = rule(",
+        "  implementation = _impl,",
+        "  attrs = {",
+        "    '_allowlist_test': attr.label(",
+        "      default = '//allowlist:allowlist',",
+        "      cfg = 'exec',",
+        "      providers = [PackageSpecificationInfo]",
+        "    ),",
+        "  },",
+        ")");
+    scratch.file(
+        "test/BUILD",
+        "load('//test:rule.bzl', 'custom_rule')",
+        "custom_rule(name='allowlist_rule')");
+
+    getConfiguredTarget("//test:allowlist_rule");
+
+    assertNoEvents();
+  }
 }