diff --git a/mathparse/mathwords.py b/mathparse/mathwords.py
index e9d1336..c9d4664 100644
--- a/mathparse/mathwords.py
+++ b/mathparse/mathwords.py
@@ -11,7 +11,8 @@
     'DUT': {
         'prefix_unary_operators': {
             'vierkantswortel van': 'sqrt',
-            'wortel van': 'sqrt'
+            'wortel van': 'sqrt',
+            'logaritme van': 'log'
         },
         'postfix_unary_operators': {
             'kwadraat': '^ 2'
@@ -66,7 +67,9 @@
     'ENG': {
         'prefix_unary_operators': {
             'square root of': 'sqrt',
-            'negative': 'neg'
+            'negative': 'neg',
+            'logarithm of': 'log',
+            'log of': 'log'
         },
         'postfix_unary_operators': {
             'squared': '^ 2',
@@ -120,7 +123,8 @@
     },
     'FRE': {
         'prefix_unary_operators': {
-            'racine carrée de': 'sqrt'
+            'racine carrée de': 'sqrt',
+            'logarithme de': 'log'
         },
         'postfix_unary_operators': {
             'au carré': '^ 2',
@@ -180,7 +184,8 @@
     'GER': {
         'prefix_unary_operators': {
             'Quadratwurzel von': 'sqrt',
-            'Wurzel von': 'sqrt'
+            'Wurzel von': 'sqrt',
+            'Logarithmus von': 'log'
         },
         'postfix_unary_operators': {
             'quadriert': '^ 2',
@@ -239,7 +244,8 @@
     },
     'GRE': {
         'prefix_unary_operators': {
-            'τετραγωνική ρίζα του': 'sqrt'
+            'τετραγωνική ρίζα του': 'sqrt',
+            'λογάριθμος του': 'log'
         },
         'postfix_unary_operators': {
             'στο τετράγωνο': '^ 2',
@@ -295,7 +301,8 @@
     },
     'ITA': {
         'prefix_unary_operators': {
-            'radice quadrata di': 'sqrt'
+            'radice quadrata di': 'sqrt',
+            'logaritmo di': 'log'
         },
         'postfix_unary_operators': {
             'al quadrato': '^ 2',
@@ -350,7 +357,8 @@
     },
     'MAR': {
         'prefix_unary_operators': {
-            'वर्गमूल': 'sqrt'
+            'वर्गमूल': 'sqrt',
+            'लॉगरिथम': 'log'
         },
         'postfix_unary_operators': {
             'वर्ग': '^ 2',
@@ -407,7 +415,8 @@
     'RUS': {
         'prefix_unary_operators': {
             'квадратный корень из': 'sqrt',
-            'корень из': 'sqrt'
+            'корень из': 'sqrt',
+            'логарифм': 'log'
         },
         'postfix_unary_operators': {
             'в квадрате': '^ 2',
@@ -469,7 +478,8 @@
     },
     'POR': {
         'prefix_unary_operators': {
-            'raiz quadrada de': 'sqrt'
+            'raiz quadrada de': 'sqrt',
+            'logaritmo de': 'log'
         },
         'postfix_unary_operators': {
             'ao quadrado': '^ 2',
@@ -524,7 +534,8 @@
     'UKR': {
         'prefix_unary_operators': {
             'квадратний корінь з': 'sqrt',
-            'корінь з': 'sqrt'
+            'корінь з': 'sqrt',
+            'логарифм': 'log'
         },
         'postfix_unary_operators': {
             'у квадраті': '^ 2',
@@ -586,7 +597,8 @@
     },
     'ESP': {
         'prefix_unary_operators': {
-            'raiz cuadrada de': 'sqrt'
+            'raiz cuadrada de': 'sqrt',
+            'logaritmo de': 'log'
         },
         'postfix_unary_operators': {
             'al cuadrado': '^ 2',
@@ -641,7 +653,8 @@
     },
     'THA': {
         'prefix_unary_operators': {
-            'สแควรูท': 'sqrt'
+            'สแควรูท': 'sqrt',
+            'ลอการิทึม': 'log'
         },
         'postfix_unary_operators': {
             'ยกกำลังสอง': '^ 2',
@@ -698,7 +711,8 @@
         'prefix_unary_operators': {
             '平方根': 'sqrt',
             '开方': 'sqrt',
-            '负': 'neg'
+            '负': 'neg',
+            '对数': 'log'
         },
         'postfix_unary_operators': {
             '平方': '^ 2',
diff --git a/tests/test_unary_operations.py b/tests/test_unary_operations.py
index b0eeb82..f71d341 100644
--- a/tests/test_unary_operations.py
+++ b/tests/test_unary_operations.py
@@ -41,3 +41,98 @@ def test_negative_number(self):
         result = mathparse.parse('-4 + 2')
 
         self.assertEqual(result, -2)
+
+    def test_log_symbolic(self):
+        result = mathparse.parse('log 100')
+
+        self.assertEqual(result, 2.0)
+
+    def test_log_symbolic_with_parenthesis(self):
+        result = mathparse.parse('log(1000)')
+
+        self.assertEqual(result, 3.0)
+
+    def test_log_english(self):
+        result = mathparse.parse('logarithm of 100', language='ENG')
+
+        self.assertEqual(result, 2.0)
+
+    def test_log_of_english(self):
+        result = mathparse.parse('log of 1000', language='ENG')
+
+        self.assertEqual(result, 3.0)
+
+    def test_log_french(self):
+        result = mathparse.parse('logarithme de 100', language='FRE')
+
+        self.assertEqual(result, 2.0)
+
+    def test_log_german(self):
+        result = mathparse.parse('Logarithmus von 100', language='GER')
+
+        self.assertEqual(result, 2.0)
+
+    def test_log_spanish(self):
+        result = mathparse.parse('logaritmo de 100', language='ESP')
+
+        self.assertEqual(result, 2.0)
+
+    def test_log_italian(self):
+        result = mathparse.parse('logaritmo di 100', language='ITA')
+
+        self.assertEqual(result, 2.0)
+
+    def test_log_portuguese(self):
+        result = mathparse.parse('logaritmo de 100', language='POR')
+
+        self.assertEqual(result, 2.0)
+
+    def test_log_russian(self):
+        result = mathparse.parse('логарифм 100', language='RUS')
+
+        self.assertEqual(result, 2.0)
+
+    def test_log_ukrainian(self):
+        result = mathparse.parse('логарифм 100', language='UKR')
+
+        self.assertEqual(result, 2.0)
+
+    def test_log_dutch(self):
+        result = mathparse.parse('logaritme van 100', language='DUT')
+
+        self.assertEqual(result, 2.0)
+
+    def test_log_greek(self):
+        result = mathparse.parse('λογάριθμος του 100', language='GRE')
+
+        self.assertEqual(result, 2.0)
+
+    def test_log_thai(self):
+        result = mathparse.parse('ลอการิทึม 100', language='THA')
+
+        self.assertEqual(result, 2.0)
+
+    def test_log_chinese(self):
+        result = mathparse.parse('对数 100', language='CHI')
+
+        self.assertEqual(result, 2.0)
+
+    def test_log_marathi(self):
+        result = mathparse.parse('लॉगरिथम 100', language='MAR')
+
+        self.assertEqual(result, 2.0)
+
+    def test_log_in_expression(self):
+        result = mathparse.parse('log 100 * 2')
+
+        self.assertEqual(result, 4.0)
+
+    def test_log_with_addition(self):
+        result = mathparse.parse('log 100 + log 1000')
+
+        self.assertEqual(result, 5.0)
+
+    def test_log_with_power(self):
+        result = mathparse.parse('(log 100) ^ 2')
+
+        self.assertEqual(result, 4.0)