diff --git a/platforms/software/maven/src/integTest/groovy/org/gradle/api/publish/maven/MavenPublishDependenciesIntegTest.groovy b/platforms/software/maven/src/integTest/groovy/org/gradle/api/publish/maven/MavenPublishDependenciesIntegTest.groovy
index 40bd833121692..87ca46b1bd42a 100644
--- a/platforms/software/maven/src/integTest/groovy/org/gradle/api/publish/maven/MavenPublishDependenciesIntegTest.groovy
+++ b/platforms/software/maven/src/integTest/groovy/org/gradle/api/publish/maven/MavenPublishDependenciesIntegTest.groovy
@@ -270,6 +270,62 @@ class MavenPublishDependenciesIntegTest extends AbstractMavenPublishIntegTest {
         }
     }
 
+    @Issue("https://github.com/gradle/gradle/issues/26996")
+    def "BOMs are not published multiple times"() {
+        given:
+        mavenRepo.module("org", "foo").publish()
+        settingsFile << "rootProject.name = 'root'"
+        buildFile << """
+            plugins {
+                id("java-library")
+                id("maven-publish")
+            }
+
+            group = 'group'
+            version = '1.0'
+
+            repositories { maven { url "${mavenRepo.uri}" } }
+            dependencies {
+                api platform("org:foo:1.0")
+            }
+
+            publishing {
+                repositories {
+                    maven { url "${mavenRepo.uri}" }
+                }
+                publications {
+                    maven(MavenPublication) {
+                        from components.java
+                    }
+                }
+            }
+        """
+
+        when:
+        succeeds "publish"
+
+        then:
+        repoModule.assertPublished()
+        def depMan = (repoModule.parsedPom.dependencyManagement.get("dependencies"))[0] as Node
+        depMan.children().size() == 1
+        with(depMan.children().first()) {
+            groupId.text() == "org"
+            artifactId.text() == "foo"
+            version.text() == "1.0"
+            type.text() == "pom"
+            scope.text() == "import"
+        }
+
+        ["apiElements", "runtimeElements"].each {
+            repoModule.parsedModuleMetadata.variant(it) {
+                dependency("org:foo:1.0") {
+                    exists()
+                    isLast()
+                }
+            }
+        }
+    }
+
     def "dependencies with multiple dependency artifacts are mapped to multiple dependency declarations in GMM"() {
         given:
         settingsFile << "rootProject.name = 'root'"
diff --git a/platforms/software/maven/src/main/java/org/gradle/api/publish/maven/internal/publication/MavenComponentParser.java b/platforms/software/maven/src/main/java/org/gradle/api/publish/maven/internal/publication/MavenComponentParser.java
index a01d01ec43f69..20d534379440b 100644
--- a/platforms/software/maven/src/main/java/org/gradle/api/publish/maven/internal/publication/MavenComponentParser.java
+++ b/platforms/software/maven/src/main/java/org/gradle/api/publish/maven/internal/publication/MavenComponentParser.java
@@ -141,6 +141,7 @@ public ParsedDependencyResult parseDependencies(
             LOG, UNSUPPORTED_FEATURE, INCOMPATIBLE_FEATURE, PUBLICATION_WARNING_FOOTER, "suppressPomMetadataWarningsFor");
 
         Set<MavenDependencyKey> seenDependencies = Sets.newHashSet();
+        Set<MavenDependencyKey> seenPlatforms = Sets.newHashSet();
         Set<DependencyConstraint> seenConstraints = Sets.newHashSet();
 
         List<MavenDependency> dependencies = new ArrayList<>();
@@ -170,6 +171,11 @@ public ParsedDependencyResult parseDependencies(
                     dependencies.add(dep);
                 }
             };
+            Consumer<MavenDependency> platformsAdder = dep -> {
+                if (seenPlatforms.add(MavenDependencyKey.of(dep))) {
+                    platforms.add(dep);
+                }
+            };
 
             for (ModuleDependency dependency : variant.getDependencies()) {
                 if (isDependencyWithDefaultArtifact(dependency) && dependencyMatchesProject(dependency, coordinates)) {
@@ -177,7 +183,7 @@ public ParsedDependencyResult parseDependencies(
                     continue;
                 }
                 if (platformSupport.isTargetingPlatform(dependency)) {
-                    dependencyFactory.convertImportDependencyConstraint(dependency, platforms::add);
+                    dependencyFactory.convertImportDependencyConstraint(dependency, platformsAdder);
                 } else {
                     dependencyFactory.convertDependency(dependency, dependencyAdder);
                 }