diff --git a/check_api/src/main/java/com/google/errorprone/ErrorProneOptions.java b/check_api/src/main/java/com/google/errorprone/ErrorProneOptions.java
index f317dab7956..49ebcba6395 100644
--- a/check_api/src/main/java/com/google/errorprone/ErrorProneOptions.java
+++ b/check_api/src/main/java/com/google/errorprone/ErrorProneOptions.java
@@ -56,6 +56,7 @@ public class ErrorProneOptions {
   private static final String ENABLE_ALL_CHECKS = "-XepAllDisabledChecksAsWarnings";
   private static final String IGNORE_SUPPRESSION_ANNOTATIONS = "-XepIgnoreSuppressionAnnotations";
   private static final String DISABLE_ALL_CHECKS = "-XepDisableAllChecks";
+  private static final String DISABLE_ALL_WARNINGS = "-XepDisableAllWarnings";
   private static final String IGNORE_UNKNOWN_CHECKS_FLAG = "-XepIgnoreUnknownCheckNames";
   private static final String DISABLE_WARNINGS_IN_GENERATED_CODE_FLAG =
       "-XepDisableWarningsInGeneratedCode";
@@ -75,7 +76,8 @@ public static int isSupportedOption(String option) {
             || option.equals(ENABLE_ALL_CHECKS)
             || option.equals(DISABLE_ALL_CHECKS)
             || option.equals(IGNORE_SUPPRESSION_ANNOTATIONS)
-            || option.equals(COMPILING_TEST_ONLY_CODE);
+            || option.equals(COMPILING_TEST_ONLY_CODE)
+            || option.equals(DISABLE_ALL_WARNINGS);
     return isSupported ? 0 : -1;
   }
 
@@ -156,6 +158,7 @@ final PatchingOptions build() {
   private final ImmutableMap<String, Severity> severityMap;
   private final boolean ignoreUnknownChecks;
   private final boolean disableWarningsInGeneratedCode;
+  private final boolean disableAllWarnings;
   private final boolean dropErrorsToWarnings;
   private final boolean enableAllChecksAsWarnings;
   private final boolean disableAllChecks;
@@ -171,6 +174,7 @@ private ErrorProneOptions(
       ImmutableList<String> remainingArgs,
       boolean ignoreUnknownChecks,
       boolean disableWarningsInGeneratedCode,
+      boolean disableAllWarnings,
       boolean dropErrorsToWarnings,
       boolean enableAllChecksAsWarnings,
       boolean disableAllChecks,
@@ -184,6 +188,7 @@ private ErrorProneOptions(
     this.remainingArgs = remainingArgs;
     this.ignoreUnknownChecks = ignoreUnknownChecks;
     this.disableWarningsInGeneratedCode = disableWarningsInGeneratedCode;
+    this.disableAllWarnings = disableAllWarnings;
     this.dropErrorsToWarnings = dropErrorsToWarnings;
     this.enableAllChecksAsWarnings = enableAllChecksAsWarnings;
     this.disableAllChecks = disableAllChecks;
@@ -211,6 +216,10 @@ public boolean disableWarningsInGeneratedCode() {
     return disableWarningsInGeneratedCode;
   }
 
+  public boolean isDisableAllWarnings() {
+    return disableAllWarnings;
+  }
+
   public boolean isDropErrorsToWarnings() {
     return dropErrorsToWarnings;
   }
@@ -241,6 +250,7 @@ public Pattern getExcludedPattern() {
 
   private static class Builder {
     private boolean ignoreUnknownChecks = false;
+    private boolean disableAllWarnings = false;
     private boolean disableWarningsInGeneratedCode = false;
     private boolean dropErrorsToWarnings = false;
     private boolean enableAllChecksAsWarnings = false;
@@ -298,6 +308,13 @@ public void setDropErrorsToWarnings(boolean dropErrorsToWarnings) {
       this.dropErrorsToWarnings = dropErrorsToWarnings;
     }
 
+    public void setDisableAllWarnings(boolean disableAllWarnings) {
+      severityMap.entrySet().stream()
+          .filter(e -> e.getValue() == Severity.WARN)
+          .forEach(e -> e.setValue(Severity.OFF));
+      this.disableAllWarnings = disableAllWarnings;
+    }
+
     public void setEnableAllChecksAsWarnings(boolean enableAllChecksAsWarnings) {
       // Checks manually disabled before this flag are reset to warning-level
       severityMap.entrySet().stream()
@@ -330,6 +347,7 @@ public ErrorProneOptions build(ImmutableList<String> remainingArgs) {
           remainingArgs,
           ignoreUnknownChecks,
           disableWarningsInGeneratedCode,
+          disableAllWarnings,
           dropErrorsToWarnings,
           enableAllChecksAsWarnings,
           disableAllChecks,
@@ -395,6 +413,9 @@ public static ErrorProneOptions processArgs(Iterable<String> args) {
         case COMPILING_TEST_ONLY_CODE:
           builder.setTestOnlyTarget(true);
           break;
+        case DISABLE_ALL_WARNINGS:
+          builder.setDisableAllWarnings(true);
+          break;
         default:
           if (arg.startsWith(SEVERITY_PREFIX)) {
             builder.parseSeverity(arg);
diff --git a/check_api/src/main/java/com/google/errorprone/scanner/ScannerSupplier.java b/check_api/src/main/java/com/google/errorprone/scanner/ScannerSupplier.java
index 92944da3689..452d8fd5120 100644
--- a/check_api/src/main/java/com/google/errorprone/scanner/ScannerSupplier.java
+++ b/check_api/src/main/java/com/google/errorprone/scanner/ScannerSupplier.java
@@ -166,6 +166,11 @@ public ScannerSupplier applyOverrides(ErrorProneOptions errorProneOptions) {
           .forEach(c -> severities.put(c.canonicalName(), SeverityLevel.WARNING));
     }
 
+    if (errorProneOptions.isDisableAllWarnings()) {
+      getAllChecks().values().stream()
+          .filter(c -> c.defaultSeverity() == SeverityLevel.WARNING)
+          .forEach(c -> disabled.add(c.canonicalName()));
+    }
     if (errorProneOptions.isDisableAllChecks()) {
       getAllChecks().values().stream()
           .filter(c -> c.disableable())
diff --git a/check_api/src/test/java/com/google/errorprone/ErrorProneOptionsTest.java b/check_api/src/test/java/com/google/errorprone/ErrorProneOptionsTest.java
index d413149eb16..26646b11ee9 100644
--- a/check_api/src/test/java/com/google/errorprone/ErrorProneOptionsTest.java
+++ b/check_api/src/test/java/com/google/errorprone/ErrorProneOptionsTest.java
@@ -161,6 +161,13 @@ public void recognizesCompilingTestOnlyCode() {
     assertThat(options.isTestOnlyTarget()).isTrue();
   }
 
+  @Test
+  public void recognizesDisableAllWarnings() {
+    ErrorProneOptions options =
+        ErrorProneOptions.processArgs(new String[] {"-XepDisableAllWarnings"});
+    assertThat(options.isDisableAllWarnings()).isTrue();
+  }
+
   @Test
   public void recognizesVisitSuppressedCode() {
     ErrorProneOptions options =