diff --git a/language-adaptors/rxjava-groovy/src/test/groovy/rx/lang/groovy/ObservableTests.groovy b/language-adaptors/rxjava-groovy/src/test/groovy/rx/lang/groovy/ObservableTests.groovy
index 10dda41461..d0ee285ae4 100644
--- a/language-adaptors/rxjava-groovy/src/test/groovy/rx/lang/groovy/ObservableTests.groovy
+++ b/language-adaptors/rxjava-groovy/src/test/groovy/rx/lang/groovy/ObservableTests.groovy
@@ -275,6 +275,12 @@ def class ObservableTests {
 
     }
 
+    @Test
+    public void testAll() {
+        Observable.toObservable(1, 2, 3).all({ x -> x > 0 }).subscribe({ result -> a.received(result) });
+        verify(a, times(1)).received(true);
+    }
+
     def class AsyncObservable implements Func1<Observer<Integer>, Subscription> {
 
         public Subscription call(final Observer<Integer> observer) {
diff --git a/rxjava-core/src/main/java/rx/Observable.java b/rxjava-core/src/main/java/rx/Observable.java
index 5d11c7b9ed..d24e48106c 100644
--- a/rxjava-core/src/main/java/rx/Observable.java
+++ b/rxjava-core/src/main/java/rx/Observable.java
@@ -36,6 +36,7 @@
 import org.mockito.MockitoAnnotations;
 
 import rx.observables.GroupedObservable;
+import rx.operators.OperationAll;
 import rx.operators.OperationConcat;
 import rx.operators.OperationDefer;
 import rx.operators.OperationDematerialize;
@@ -1665,6 +1666,35 @@ public T call(T t1, T t2) {
         });
     }
 
+    /**
+     * Determines whether all elements of an observable sequence satisfies a condition.
+     * @param sequence an observable sequence whose elements to apply the predicate to.
+     * @param predicate a function to test each element for a condition.
+     * @param <T> the type of observable.
+     * @return true if all elements of an observable sequence satisfies a condition; otherwise, false.
+     */
+    public static <T> Observable<Boolean> all(final Observable<T> sequence, final Func1<T, Boolean> predicate) {
+        return _create(OperationAll.all(sequence, predicate));
+    }
+
+    /**
+     * Determines whether all elements of an observable sequence satisfies a condition.
+     * @param sequence an observable sequence whose elements to apply the predicate to.
+     * @param predicate a function to test each element for a condition.
+     * @param <T> the type of observable.
+     * @return true if all elements of an observable sequence satisfies a condition; otherwise, false.
+     */
+    public static <T> Observable<Boolean> all(final Observable<T> sequence, Object predicate) {
+        final FuncN _f = Functions.from(predicate);
+
+        return all(sequence, new Func1<T, Boolean>() {
+            @Override
+            public Boolean call(T t) {
+                return (Boolean) _f.call(t);
+            }
+        });
+    }
+
     /**
      * Returns an Observable that skips the first <code>num</code> items emitted by the source
      * Observable. You can ignore the first <code>num</code> items emitted by an Observable and attend
@@ -2973,6 +3003,24 @@ public Observable<T> scan(final T initialValue, final Object accumulator) {
         return scan(this, initialValue, accumulator);
     }
 
+    /**
+     * Determines whether all elements of an observable sequence satisfies a condition.
+     * @param predicate a function to test each element for a condition.
+     * @return true if all elements of an observable sequence satisfies a condition; otherwise, false.
+     */
+    public Observable<Boolean> all(Func1<T, Boolean> predicate) {
+        return all(this, predicate);
+    }
+
+    /**
+     * Determines whether all elements of an observable sequence satisfies a condition.
+     * @param predicate a function to test each element for a condition.
+     * @return true if all elements of an observable sequence satisfies a condition; otherwise, false.
+     */
+    public Observable<Boolean> all(Object predicate) {
+        return all(this, predicate);
+    }
+
     /**
      * Returns an Observable that skips the first <code>num</code> items emitted by the source
      * Observable.
diff --git a/rxjava-core/src/main/java/rx/operators/OperationAll.java b/rxjava-core/src/main/java/rx/operators/OperationAll.java
new file mode 100644
index 0000000000..4ce29069a2
--- /dev/null
+++ b/rxjava-core/src/main/java/rx/operators/OperationAll.java
@@ -0,0 +1,141 @@
+package rx.operators;
+
+import org.junit.Test;
+import rx.Observable;
+import rx.Observer;
+import rx.Subscription;
+import rx.util.AtomicObservableSubscription;
+import rx.util.functions.Func1;
+
+import java.util.concurrent.atomic.AtomicBoolean;
+
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.verifyNoMoreInteractions;
+
+public class OperationAll {
+
+    public static <T> Func1<Observer<Boolean>, Subscription> all(Observable<T> sequence, Func1<T, Boolean> predicate) {
+        return new AllObservable<T>(sequence, predicate);
+    }
+
+    private static class AllObservable<T> implements Func1<Observer<Boolean>, Subscription> {
+        private final Observable<T> sequence;
+        private final Func1<T, Boolean> predicate;
+
+        private final AtomicBoolean status = new AtomicBoolean(true);
+        private final AtomicObservableSubscription subscription = new AtomicObservableSubscription();
+
+
+        private AllObservable(Observable<T> sequence, Func1<T, Boolean> predicate) {
+            this.sequence = sequence;
+            this.predicate = predicate;
+        }
+
+
+        @Override
+        public Subscription call(final Observer<Boolean> observer) {
+            return subscription.wrap(sequence.subscribe(new Observer<T>() {
+                @Override
+                public void onCompleted() {
+                    if (status.get()) {
+                        observer.onNext(true);
+                        observer.onCompleted();
+                    }
+                }
+
+                @Override
+                public void onError(Exception e) {
+                    observer.onError(e);
+                }
+
+                @Override
+                public void onNext(T args) {
+                    boolean result = predicate.call(args);
+                    boolean changed = status.compareAndSet(true, result);
+
+                    if (changed && !result) {
+                        observer.onNext(false);
+                        observer.onCompleted();
+                        subscription.unsubscribe();
+                    }
+                }
+            }));
+        }
+    }
+
+    public static class UnitTest {
+
+        @Test
+        @SuppressWarnings("unchecked")
+        public void testAll() {
+            Observable<String> obs = Observable.from("one", "two", "six");
+
+            Observer<Boolean> observer = mock(Observer.class);
+            Observable.create(all(obs, new Func1<String, Boolean>() {
+                @Override
+                public Boolean call(String s) {
+                    return s.length() == 3;
+                }
+            })).subscribe(observer);
+
+            verify(observer).onNext(true);
+            verify(observer).onCompleted();
+            verifyNoMoreInteractions(observer);
+        }
+
+        @Test
+        @SuppressWarnings("unchecked")
+        public void testNotAll() {
+            Observable<String> obs = Observable.from("one", "two", "three", "six");
+
+            Observer<Boolean> observer = mock(Observer.class);
+            Observable.create(all(obs, new Func1<String, Boolean>() {
+                @Override
+                public Boolean call(String s) {
+                    return s.length() == 3;
+                }
+            })).subscribe(observer);
+
+            verify(observer).onNext(false);
+            verify(observer).onCompleted();
+            verifyNoMoreInteractions(observer);
+        }
+
+        @Test
+        @SuppressWarnings("unchecked")
+        public void testEmpty() {
+            Observable<String> obs = Observable.empty();
+
+            Observer<Boolean> observer = mock(Observer.class);
+            Observable.create(all(obs, new Func1<String, Boolean>() {
+                @Override
+                public Boolean call(String s) {
+                    return s.length() == 3;
+                }
+            })).subscribe(observer);
+
+            verify(observer).onNext(true);
+            verify(observer).onCompleted();
+            verifyNoMoreInteractions(observer);
+        }
+
+        @Test
+        @SuppressWarnings("unchecked")
+        public void testError() {
+            Exception error = new Exception();
+            Observable<String> obs = Observable.error(error);
+
+            Observer<Boolean> observer = mock(Observer.class);
+            Observable.create(all(obs, new Func1<String, Boolean>() {
+                @Override
+                public Boolean call(String s) {
+                    return s.length() == 3;
+                }
+            })).subscribe(observer);
+
+            verify(observer).onError(error);
+            verifyNoMoreInteractions(observer);
+        }
+    }
+}