diff --git a/mkl_random/__init__.py b/mkl_random/__init__.py
index 512027b..01ee956 100644
--- a/mkl_random/__init__.py
+++ b/mkl_random/__init__.py
@@ -42,4 +42,6 @@
     test = PytestTester(__name__)
     del PytestTester
 
+from ._patch import monkey_patch, use_in_numpy, restore, is_patched, patched_names, mkl_random
+
 del _init_helper
diff --git a/mkl_random/src/_patch.pyx b/mkl_random/src/_patch.pyx
new file mode 100644
index 0000000..6c39ff3
--- /dev/null
+++ b/mkl_random/src/_patch.pyx
@@ -0,0 +1,275 @@
+# Copyright (c) 2019, Intel Corporation
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are met:
+#
+#     * Redistributions of source code must retain the above copyright notice,
+#       this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above copyright
+#       notice, this list of conditions and the following disclaimer in the
+#       documentation and/or other materials provided with the distribution.
+#     * Neither the name of Intel Corporation nor the names of its contributors
+#       may be used to endorse or promote products derived from this software
+#       without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
+# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+# distutils: language = c
+# cython: language_level=3
+
+"""
+Patch NumPy's `numpy.random` symbols to use mkl_random implementations.
+
+This is attribute-level monkey patching. It can replace legacy APIs like
+`numpy.random.RandomState` and global distribution functions, but it does not
+replace NumPy's `Generator`/`default_rng()` unless mkl_random provides fully
+compatible replacements.
+"""
+
+from threading import local as threading_local
+from contextlib import ContextDecorator
+
+import numpy as _np
+from . import mklrand as _mr
+
+
+cdef tuple _DEFAULT_NAMES = (
+    # Legacy seeding / state
+    "seed",
+    "get_state",
+    "set_state",
+    "RandomState",
+
+    # Common global sampling helpers
+    "random",
+    "random_sample",
+    "sample",
+    "rand",
+    "randn",
+    "bytes",
+
+    # Integers
+    "randint",
+
+    # Common distributions (only patched if present on both sides)
+    "standard_normal",
+    "normal",
+    "uniform",
+    "exponential",
+    "gamma",
+    "beta",
+    "chisquare",
+    "f",
+    "lognormal",
+    "laplace",
+    "logistic",
+    "multivariate_normal",
+    "poisson",
+    "power",
+    "rayleigh",
+    "triangular",
+    "vonmises",
+    "wald",
+    "weibull",
+    "zipf",
+
+    # Permutations / choices
+    "choice",
+    "permutation",
+    "shuffle",
+)
+
+
+cdef class patch:
+    cdef bint _is_patched
+    cdef object _numpy_module
+    cdef object _originals   # dict: name -> original object
+    cdef object _patched     # list of names actually patched
+
+    def __cinit__(self):
+        self._is_patched = False
+        self._numpy_module = None
+        self._originals = {}
+        self._patched = []
+
+    def do_patch(self, numpy_module=None, names=None, bint strict=False):
+        """
+        Patch the given numpy module (default: imported numpy) in-place.
+
+        Parameters
+        ----------
+        numpy_module : module, optional
+            The numpy module to patch (e.g. `import numpy as np; use_in_numpy(np)`).
+        names : iterable[str], optional
+            Attributes under `numpy_module.random` to patch. Defaults to _DEFAULT_NAMES.
+        strict : bool
+            If True, raise if any requested symbol cannot be patched.
+        """
+        if numpy_module is None:
+            numpy_module = _np
+        if names is None:
+            names = _DEFAULT_NAMES
+
+        if not hasattr(numpy_module, "random"):
+            raise TypeError("Expected a numpy-like module with a `.random` attribute.")
+
+        # If already patched, only allow idempotent re-entry for the same numpy module.
+        if self._is_patched:
+            if self._numpy_module is numpy_module:
+                return
+            raise RuntimeError("Already patched a different numpy module; call restore() first.")
+
+        np_random = numpy_module.random
+
+        originals = {}
+        patched = []
+        missing = []
+
+        for name in names:
+            if not hasattr(np_random, name) or not hasattr(_mr, name):
+                missing.append(name)
+                continue
+            originals[name] = getattr(np_random, name)
+            setattr(np_random, name, getattr(_mr, name))
+            patched.append(name)
+
+        if strict and missing:
+            # revert partial patch before raising
+            for n, v in originals.items():
+                setattr(np_random, n, v)
+            raise AttributeError(
+                "Could not patch these names (missing on numpy.random or mkl_random.mklrand): "
+                + ", ".join([str(x) for x in missing])
+            )
+
+        self._numpy_module = numpy_module
+        self._originals = originals
+        self._patched = patched
+        self._is_patched = True
+
+    def do_unpatch(self):
+        """
+        Restore the previously patched numpy module.
+        """
+        if not self._is_patched:
+            return
+        numpy_module = self._numpy_module
+        np_random = numpy_module.random
+        for n, v in self._originals.items():
+            setattr(np_random, n, v)
+
+        self._numpy_module = None
+        self._originals = {}
+        self._patched = []
+        self._is_patched = False
+
+    def is_patched(self):
+        return self._is_patched
+
+    def patched_names(self):
+        """
+        Returns list of names that were actually patched.
+        """
+        return list(self._patched)
+
+
+_tls = threading_local()
+
+
+def _is_tls_initialized():
+    return (getattr(_tls, "initialized", None) is not None) and (_tls.initialized is True)
+
+
+def _initialize_tls():
+    _tls.patch = patch()
+    _tls.initialized = True
+
+
+def monkey_patch(numpy_module=None, names=None, strict=False):
+    """
+    Enables using mkl_random in the given NumPy module by patching `numpy.random`.
+
+    Examples
+    --------
+    >>> import numpy as np
+    >>> import mkl_random
+    >>> mkl_random.is_patched()
+    False
+    >>> mkl_random.monkey_patch(np)
+    >>> mkl_random.is_patched()
+    True
+    >>> mkl_random.restore()
+    >>> mkl_random.is_patched()
+    False
+    """
+    if not _is_tls_initialized():
+        _initialize_tls()
+    _tls.patch.do_patch(numpy_module=numpy_module, names=names, strict=bool(strict))
+
+
+def use_in_numpy(numpy_module=None, names=None, strict=False):
+    """
+    Backward-compatible alias for monkey_patch().
+    """
+    monkey_patch(numpy_module=numpy_module, names=names, strict=strict)
+
+
+def restore():
+    """
+    Disables using mkl_random in NumPy by restoring the original `numpy.random` symbols.
+    """
+    if not _is_tls_initialized():
+        _initialize_tls()
+    _tls.patch.do_unpatch()
+
+
+def is_patched():
+    """
+    Returns whether NumPy has been patched with mkl_random.
+    """
+    if not _is_tls_initialized():
+        _initialize_tls()
+    return bool(_tls.patch.is_patched())
+
+
+def patched_names():
+    """
+    Returns the names actually patched in `numpy.random`.
+    """
+    if not _is_tls_initialized():
+        _initialize_tls()
+    return _tls.patch.patched_names()
+
+
+class mkl_random(ContextDecorator):
+    """
+    Context manager and decorator to temporarily patch NumPy's `numpy.random`.
+
+    Examples
+    --------
+    >>> import numpy as np
+    >>> import mkl_random
+    >>> with mkl_random.mkl_random():
+    ...     x = np.random.normal(size=10)
+    """
+    def __init__(self, numpy_module=None, names=None, strict=False):
+        self._numpy_module = numpy_module
+        self._names = names
+        self._strict = strict
+
+    def __enter__(self):
+        monkey_patch(numpy_module=self._numpy_module, names=self._names, strict=self._strict)
+        return self
+
+    def __exit__(self, *exc):
+        restore()
+        return False
diff --git a/mkl_random/tests/test_patch.py b/mkl_random/tests/test_patch.py
new file mode 100644
index 0000000..3dabea1
--- /dev/null
+++ b/mkl_random/tests/test_patch.py
@@ -0,0 +1,95 @@
+import numpy as np
+import mkl_random
+import pytest
+
+def test_is_patched():
+    """
+    Test that is_patched() returns correct status.
+    """
+    assert not mkl_random.is_patched()
+    mkl_random.monkey_patch(np)
+    assert mkl_random.is_patched()
+    mkl_random.restore()
+    assert not mkl_random.is_patched()
+
+def test_monkey_patch_and_restore():
+    """
+    Test that monkey_patch replaces and restore brings back original functions.
+    """
+    # Store original functions
+    orig_normal = np.random.normal
+    orig_randint = np.random.randint
+    orig_RandomState = np.random.RandomState
+
+    try:
+        mkl_random.monkey_patch(np)
+
+        # Check that functions are now different objects
+        assert np.random.normal is not orig_normal
+        assert np.random.randint is not orig_randint
+        assert np.random.RandomState is not orig_RandomState
+
+        # Check that they are from mkl_random
+        assert np.random.normal is mkl_random.mklrand.normal
+        assert np.random.RandomState is mkl_random.mklrand.RandomState
+
+    finally:
+        mkl_random.restore()
+
+    # Check that original functions are restored
+    assert mkl_random.is_patched() is False
+    assert np.random.normal is orig_normal
+    assert np.random.randint is orig_randint
+    assert np.random.RandomState is orig_RandomState
+
+def test_context_manager():
+    """
+    Test that the context manager patches and automatically restores.
+    """
+    orig_uniform = np.random.uniform
+    assert not mkl_random.is_patched()
+
+    with mkl_random.mkl_random(np):
+        assert mkl_random.is_patched() is True
+        assert np.random.uniform is not orig_uniform
+        # Smoke test inside context
+        arr = np.random.uniform(size=10)
+        assert arr.shape == (10,)
+
+    assert not mkl_random.is_patched()
+    assert np.random.uniform is orig_uniform
+
+def test_patched_functions_callable():
+    """
+    Smoke test to ensure some patched functions can be called without error.
+    """
+    mkl_random.monkey_patch(np)
+    try:
+        # These calls should now be routed to mkl_random's implementations
+        x = np.random.standard_normal(size=100)
+        assert x.shape == (100,)
+
+        y = np.random.randint(0, 100, size=50)
+        assert y.shape == (50,)
+        assert np.all(y >= 0) and np.all(y < 100)
+
+        st = np.random.RandomState(12345)
+        z = st.rand(10)
+        assert z.shape == (10,)
+
+    finally:
+        mkl_random.restore()
+
+def test_patched_names():
+    """
+    Test that patched_names() returns a list of patched symbols.
+    """
+    try:
+        mkl_random.monkey_patch(np)
+        names = mkl_random.patched_names()
+        assert isinstance(names, list)
+        assert len(names) > 0
+        assert "normal" in names
+        assert "RandomState" in names
+    finally:
+        mkl_random.restore()
diff --git a/setup.py b/setup.py
index c47ebfb..70f83ea 100644
--- a/setup.py
+++ b/setup.py
@@ -81,6 +81,14 @@ def extensions():
             extra_compile_args = eca,
             define_macros=defs + [("NDEBUG", None)],
             language="c++"
+        ),
+
+        Extension(
+            "mkl_random._patch",
+            sources=[join("mkl_random", "src", "_patch.pyx")],
+            include_dirs=[np.get_include()],
+            define_macros=defs + [("NDEBUG", None)],
+            language="c",
         )
     ]