diff --git a/tests/test_protocol_binary.py b/tests/test_protocol_binary.py
index d4cf41f2..89020c58 100644
--- a/tests/test_protocol_binary.py
+++ b/tests/test_protocol_binary.py
@@ -9,6 +9,7 @@
 from thriftpy2.protocol import binary as proto
 from thriftpy2.thrift import TPayload, TType
 from thriftpy2.utils import hexlify, serialize
+from thriftpy2.transport.memory import TMemoryBuffer
 
 
 class TItem(TPayload):
@@ -173,6 +174,56 @@ def test_write_huge_struct():
     proto.TBinaryProtocol(b).write_struct(item)
 
 
+@pytest.fixture
+def buffer_supports_non_contiguous():
+    """Pypy 3.9 and 3.10 feature BytesIO supporting non-contiguous input data."""
+    b = BytesIO()
+    try:
+        b.write(memoryview(b"abcd")[::-1])
+    except BufferError:
+        return False
+    return True
+
+
+def test_write_memoryview(buffer_supports_non_contiguous):
+    # contiguous 8-bit items
+    b = TMemoryBuffer()
+    data = memoryview(b"hello world!\x01")
+    proto.write_val(b, TType.BINARY, data)
+    b.flush()
+    assert "00 00 00 0d 68 65 6c 6c 6f 20 77 6f 72 6c 64 21 01" == \
+        hexlify(b.getvalue())
+
+    # not 8-bit items
+    b = TMemoryBuffer()
+    data = memoryview(b"0000111122223333").cast("h")
+    proto.write_val(b, TType.BINARY, data)
+    b.flush()
+    assert "00 00 00 10 30 30 30 30 31 31 31 31 32 32 32 32 33 33 33 33" == \
+        hexlify(b.getvalue())
+
+    # not contiguous
+    b = TMemoryBuffer()
+    data = memoryview(b"0123")[::-1]
+    if not buffer_supports_non_contiguous:
+        with pytest.raises(BufferError, match="contiguous"):
+            proto.write_val(b, TType.BINARY, data)
+    else:
+        proto.write_val(b, TType.BINARY, data)
+        b.flush()
+        assert "00 00 00 04 33 32 31 30" == \
+            hexlify(b.getvalue())
+
+
+def test_write_bytearray():
+    b = TMemoryBuffer()
+    proto.write_val(b, TType.BINARY, bytearray("hello world!", "utf-8"))
+    b.flush()
+    assert "00 00 00 0c 68 65 6c 6c 6f 20 77 6f 72 6c 64 21" == \
+        hexlify(b.getvalue())
+
+
+
 @pytest.mark.skipif(not _compat.CYTHON, reason="cybin required")
 def test_string_binary_equivalency():
     from thriftpy2.protocol.binary import TBinaryProtocolFactory
diff --git a/tests/test_protocol_cybinary.py b/tests/test_protocol_cybinary.py
index 4bc8f7e6..5a09a8f8 100644
--- a/tests/test_protocol_cybinary.py
+++ b/tests/test_protocol_cybinary.py
@@ -133,6 +133,38 @@ def test_write_string():
         hexlify(b.getvalue())
 
 
+def test_write_memoryview():
+    # contiguous 8-bit items
+    b = TCyMemoryBuffer()
+    data = memoryview(b"hello world!\x01")
+    proto.write_val(b, TType.BINARY, data)
+    b.flush()
+    assert "00 00 00 0d 68 65 6c 6c 6f 20 77 6f 72 6c 64 21 01" == \
+        hexlify(b.getvalue())
+
+    # not 8-bit items
+    b = TCyMemoryBuffer()
+    data = memoryview(b"0000111122223333").cast("h")
+    proto.write_val(b, TType.BINARY, data)
+    b.flush()
+    assert "00 00 00 10 30 30 30 30 31 31 31 31 32 32 32 32 33 33 33 33" == \
+        hexlify(b.getvalue())
+
+    # not contiguous
+    with pytest.raises(BufferError, match="contiguous"):
+        b = TCyMemoryBuffer()
+        data = memoryview(b"0123")[::-1]
+        proto.write_val(b, TType.BINARY, data)
+
+
+def test_write_bytearray():
+    b = TCyMemoryBuffer()
+    proto.write_val(b, TType.BINARY, bytearray("hello world!", "utf-8"))
+    b.flush()
+    assert "00 00 00 0c 68 65 6c 6c 6f 20 77 6f 72 6c 64 21" == \
+        hexlify(b.getvalue())
+
+
 def test_read_string():
     b = TCyMemoryBuffer(b"\x00\x00\x00\x0c"
                         b"\xe4\xbd\xa0\xe5\xa5\xbd\xe4\xb8\x96\xe7\x95\x8c")
diff --git a/thriftpy2/protocol/binary.py b/thriftpy2/protocol/binary.py
index fbffa291..55073e3b 100644
--- a/thriftpy2/protocol/binary.py
+++ b/thriftpy2/protocol/binary.py
@@ -119,9 +119,11 @@ def write_val(outbuf, ttype, val, spec=None):
         outbuf.write(pack_double(val))
 
     elif ttype in BIN_TYPES:
-        if not isinstance(val, bytes):
+        if isinstance(val, str):
             val = val.encode('utf-8')
-        outbuf.write(pack_string(val))
+        val = memoryview(val)
+        outbuf.write(pack_i32(val.nbytes))
+        outbuf.write(val)
 
     elif ttype == TType.SET or ttype == TType.LIST:
         if isinstance(spec, tuple):
diff --git a/thriftpy2/protocol/cybin/cybin.pyx b/thriftpy2/protocol/cybin/cybin.pyx
index 19ccd317..48e97508 100644
--- a/thriftpy2/protocol/cybin/cybin.pyx
+++ b/thriftpy2/protocol/cybin/cybin.pyx
@@ -5,7 +5,7 @@ import sys
 from libc.stdlib cimport free, malloc
 from libc.stdint cimport int16_t, int32_t, int64_t
 from libc.string cimport memcpy
-from cpython cimport bool
+from cpython cimport bool, PyObject_GetBuffer, PyBuffer_Release, PyBUF_ANY_CONTIGUOUS, PyBUF_SIMPLE
 
 from thriftpy2.thrift import TDecodeException
 from thriftpy2.transport.cybase cimport CyTransportBase, STACK_STRING_LEN
@@ -135,6 +135,16 @@ cdef inline write_string(CyTransportBase buf, bytes val):
     buf.c_write(<char*>val, val_len)
 
 
+cdef inline write_buffer(CyTransportBase buf, val):
+    cdef Py_buffer in_buffer
+    PyObject_GetBuffer(val, &in_buffer, PyBUF_SIMPLE | PyBUF_ANY_CONTIGUOUS)
+    try:
+        write_i32(buf, in_buffer.len)
+        buf.c_write(<char *>in_buffer.buf, in_buffer.len)
+    finally:
+        PyBuffer_Release(&in_buffer)
+
+
 cdef inline write_dict(CyTransportBase buf, object val, spec):
     cdef int val_len
     cdef TType v_type, k_type
@@ -387,7 +397,7 @@ cdef c_write_val(CyTransportBase buf, TType ttype, val, spec=None):
     elif ttype == T_BINARY:
         if isinstance(val, str):
             val = val.encode()
-        write_string(buf, val)
+        write_buffer(buf, val)
 
     elif ttype == T_STRING:
         if not isinstance(val, bytes):
diff --git a/thriftpy2/transport/cybase.pxd b/thriftpy2/transport/cybase.pxd
index 81586668..bdddd2cb 100644
--- a/thriftpy2/transport/cybase.pxd
+++ b/thriftpy2/transport/cybase.pxd
@@ -20,7 +20,7 @@ cdef class CyTransportBase(object):
     cdef object trans
 
     cdef c_read(self, int sz, char* out)
-    cdef c_write(self, char* data, int sz)
+    cdef c_write(self, const char* data, int sz)
     cdef c_flush(self)
 
     cdef get_string(self, int sz)
diff --git a/thriftpy2/transport/cybase.pyx b/thriftpy2/transport/cybase.pyx
index 192ccabf..517a56ac 100644
--- a/thriftpy2/transport/cybase.pyx
+++ b/thriftpy2/transport/cybase.pyx
@@ -108,7 +108,7 @@ cdef class CyTransportBase(object):
     cdef c_read(self, int sz, char* out):
         pass
 
-    cdef c_write(self, char* data, int sz):
+    cdef c_write(self, const char* data, int sz):
         pass
 
     cdef c_flush(self):
diff --git a/thriftpy2/transport/memory/cymemory.pyx b/thriftpy2/transport/memory/cymemory.pyx
index 7dc8ae65..95d70e23 100644
--- a/thriftpy2/transport/memory/cymemory.pyx
+++ b/thriftpy2/transport/memory/cymemory.pyx
@@ -7,6 +7,7 @@ from thriftpy2.transport.cybase cimport (
     CyTransportBase,
     DEFAULT_BUFFER,
 )
+from cpython cimport bool, PyObject_GetBuffer, PyBuffer_Release, PyBUF_ANY_CONTIGUOUS, PyBUF_SIMPLE
 
 
 cdef class TCyMemoryBuffer(CyTransportBase):
@@ -37,6 +38,14 @@ cdef class TCyMemoryBuffer(CyTransportBase):
         if r == -1:
             raise MemoryError("Write to memory error")
 
+    def c_write_buffer(self, const unsigned char[::1] data):
+        cdef Py_buffer in_buffer
+        PyObject_GetBuffer(data, &in_buffer, PyBUF_SIMPLE | PyBUF_ANY_CONTIGUOUS)
+        try:
+            self.c_write(<char *>in_buffer.buf, in_buffer.len)
+        finally:
+            PyBuffer_Release(&in_buffer)
+
     cdef _getvalue(self):
         cdef char *out
         cdef int size = self.buf.data_size
@@ -62,8 +71,7 @@ cdef class TCyMemoryBuffer(CyTransportBase):
         if isinstance(data, unicode):
             data = (<unicode>data).encode('utf-8')
 
-        cdef int sz = len(data)
-        return self.c_write(data, sz)
+        return self.c_write_buffer(data)
 
     def is_open(self):
         return True