diff --git a/CHANGELOG.md b/CHANGELOG.md
index 76eb5541..a558ec8c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -18,6 +18,7 @@ release points are not being annotated in GitHub.
 - Unit tests for `sarpy/consistency/sicd_consistency.py`
 - Support reading CPHDs with an AmpSF PVP whose Data/SignalArrayFormat is CF8
 - Unit tests for `sarpy/consistency/sidd_consistency.py`
+- Support for MATESA TRE
 ### Fixed
 - `sarpy.io.kml.add_polygon` coordinate conditioning for older numpy versions
 - Replace unsupported `pillow` constant `Image.ANTIALIAS` with `Image.LANCZOS`
diff --git a/sarpy/io/general/nitf_elements/tres/unclass/MATESA.py b/sarpy/io/general/nitf_elements/tres/unclass/MATESA.py
new file mode 100644
index 00000000..c618cb9f
--- /dev/null
+++ b/sarpy/io/general/nitf_elements/tres/unclass/MATESA.py
@@ -0,0 +1,36 @@
+
+from ..tre_elements import TREExtension, TREElement
+
+__classification__ = "UNCLASSIFIED"
+__author__ = "Brad Hards"
+
+# From STDI-0002 Volume 1 Appendix AK: MATESA 1.1
+
+class MATE(TREElement):
+    def __init__(self, value):
+        super(MATE, self).__init__()
+        self.add_field('SOURCE', 's', 42, value)
+        self.add_field('MATE_TYPE', 's', 16, value)
+        self.add_field('MATE_ID_LEN', 'd', 4, value)
+        self.add_field('MATE_ID', 's', self.MATE_ID_LEN, value)
+
+class GROUP(TREElement):
+    def __init__(self, value):
+        super(GROUP, self).__init__()
+        self.add_field('RELATIONSHIP', 's', 24, value)
+        self.add_field('NUM_MATES', 'd', 4, value)
+        self.add_loop('MATEs', self.NUM_MATES, MATE, value)
+
+class MATESAType(TREElement):
+    def __init__(self, value):
+        super(MATESAType, self).__init__()
+        self.add_field('CUR_SOURCE', 's', 42, value)
+        self.add_field('CUR_MATE_TYPE', 's', 16, value)
+        self.add_field('CUR_FILE_ID_LEN', 'd', 4, value)
+        self.add_field('CUR_FILE_ID', 's', self.CUR_FILE_ID_LEN, value)
+        self.add_field('NUM_GROUPS', 'd', 4, value)
+        self.add_loop('GROUPs', self.NUM_GROUPS, GROUP, value)
+
+class MATESA(TREExtension):
+    _tag_value = 'MATESA'
+    _data_type = MATESAType
diff --git a/tests/data/example_matesa_tre.bin b/tests/data/example_matesa_tre.bin
new file mode 100644
index 00000000..4807fda6
--- /dev/null
+++ b/tests/data/example_matesa_tre.bin
@@ -0,0 +1 @@
+MATESA00889EO-1_HYPERION                             FTITLE          005507APR2005_Hyperion_331406N0442000E_SWIR172_1p2B_L1R-BIP0005RADIOMTRC_CALIB         0001EO-1_HYPERION                             FILENAME        0020HypGain_revC.dat.svfPARENT                  0001EO-1_HYPERION                             FILENAME        0032EO12005097_020D020C_r1_WPS_01.L0PRE_DARKCOLLECT         0001EO-1_HYPERION                             FILENAME        0032EO12005097_020A0209_r1_WPS_01.L0POST_DARKCOLLECT        0001EO-1_HYPERION                             FILENAME        0032EO12005097_020F020E_r1_WPS_01.L0PARENT                  0003EO-1_HYPERION                             FILENAME        0026EO1H1680372005097110PZ.L1REO-1_HYPERION                             FILENAME        0026EO1H1680372005097110PZ.AUXEO-1_HYPERION                             FILENAME        0026EO1H1680372005097110PZ.MET
\ No newline at end of file
diff --git a/tests/data/example_tre_extractor.py b/tests/data/example_tre_extractor.py
new file mode 100644
index 00000000..260dbb39
--- /dev/null
+++ b/tests/data/example_tre_extractor.py
@@ -0,0 +1,16 @@
+import mmap
+import os
+import pathlib
+
+# From https://nsgreg.nga.mil/doc/view?i=5516
+nitf_with_tres = '07APR2005_Hyperion_331406N0442000E_SWIR172_1p2B_L1R-BIP.ntf'
+cetags = [b'MATESA']
+
+for cetag in cetags:
+    with open(nitf_with_tres, 'r+b') as nitffile, mmap.mmap(nitffile.fileno(), 0) as mm:
+        mm.seek(mm.find(cetag, 0) + len(cetag), os.SEEK_SET)
+        cel = mm.read(5)
+        data = mm.read(int(cel))
+    output_file = 'example_{}_tre.bin'.format(cetag.decode('ascii').lower())
+    (pathlib.Path(__file__).parent / output_file).write_bytes(cetag + cel + data)
+
diff --git a/tests/io/general/test_tre.py b/tests/io/general/test_tre.py
index 183f6828..bf6a2363 100644
--- a/tests/io/general/test_tre.py
+++ b/tests/io/general/test_tre.py
@@ -7,3 +7,8 @@ class TestTreRegistry(unittest.TestCase):
     def test_find_tre(self):
         the_tre = find_tre('ACFTA')
         self.assertEqual(the_tre, ACFTA)
+
+
+def test_matesa(tests_path):
+    example = find_tre('MATESA').from_bytes((tests_path / 'data/example_matesa_tre.bin').read_bytes(), 0)
+    assert example.DATA.GROUPs[-1].MATEs[-1].MATE_ID == 'EO1H1680372005097110PZ.MET'