diff --git a/prism/enc/pm_encoding.h b/prism/enc/pm_encoding.h
index f9a457fb39..217c878d93 100644
--- a/prism/enc/pm_encoding.h
+++ b/prism/enc/pm_encoding.h
@@ -165,6 +165,7 @@ extern pm_encoding_t pm_encoding_cp855;
 extern pm_encoding_t pm_encoding_euc_jp;
 extern pm_encoding_t pm_encoding_gbk;
 extern pm_encoding_t pm_encoding_ibm437;
+extern pm_encoding_t pm_encoding_ibm720;
 extern pm_encoding_t pm_encoding_iso_8859_1;
 extern pm_encoding_t pm_encoding_iso_8859_2;
 extern pm_encoding_t pm_encoding_iso_8859_3;
diff --git a/prism/enc/pm_tables.c b/prism/enc/pm_tables.c
index 0e3f4a6fa3..864b3cd549 100644
--- a/prism/enc/pm_tables.c
+++ b/prism/enc/pm_tables.c
@@ -120,6 +120,30 @@ static uint8_t pm_encoding_ibm437_table[256] = {
     0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // Fx
 };
 
+/**
+ * Each element of the following table contains a bitfield that indicates a
+ * piece of information about the corresponding IBM720 character.
+ */
+static uint8_t pm_encoding_ibm720_table[256] = {
+//  0  1  2  3  4  5  6  7  8  9  A  B  C  D  E  F
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0x
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 1x
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 2x
+    2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 0, 0, 0, 0, 0, 0, // 3x
+    0, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, // 4x
+    7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 0, 0, 0, 0, 0, // 5x
+    0, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, // 6x
+    3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 0, 0, 0, 0, 0, // 7x
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 8x
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 9x
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // Ax
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // Bx
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // Cx
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // Dx
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // Ex
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // Fx
+};
+
 /**
  * Each element of the following table contains a bitfield that indicates a
  * piece of information about the corresponding ISO-8859-1 character.
@@ -789,6 +813,7 @@ PRISM_ENCODING_TABLE(cp850)
 PRISM_ENCODING_TABLE(cp852)
 PRISM_ENCODING_TABLE(cp855)
 PRISM_ENCODING_TABLE(ibm437)
+PRISM_ENCODING_TABLE(ibm720)
 PRISM_ENCODING_TABLE(iso_8859_1)
 PRISM_ENCODING_TABLE(iso_8859_2)
 PRISM_ENCODING_TABLE(iso_8859_3)
@@ -877,6 +902,16 @@ pm_encoding_t pm_encoding_ibm437 = {
     .multibyte = false
 };
 
+/** IBM720 */
+pm_encoding_t pm_encoding_ibm720 = {
+    .name = "IBM720",
+    .char_width = pm_encoding_single_char_width,
+    .alnum_char = pm_encoding_ibm720_alnum_char,
+    .alpha_char = pm_encoding_ibm720_alpha_char,
+    .isupper_char = pm_encoding_ibm720_isupper_char,
+    .multibyte = false
+};
+
 /** ISO-8859-1 */
 pm_encoding_t pm_encoding_iso_8859_1 = {
     .name = "ISO-8859-1",
diff --git a/prism/prism.c b/prism/prism.c
index 93964a8e45..a3702c864a 100644
--- a/prism/prism.c
+++ b/prism/prism.c
@@ -6073,6 +6073,7 @@ parser_lex_magic_comment_encoding_value(pm_parser_t *parser, const uint8_t *star
     ENCODING1("CP855", pm_encoding_cp855);
     ENCODING2("GBK", "CP936", pm_encoding_gbk);
     ENCODING2("IBM437", "CP437", pm_encoding_ibm437);
+    ENCODING2("IBM720", "CP720", pm_encoding_ibm720);
     ENCODING2("ISO-8859-1", "ISO8859-1", pm_encoding_iso_8859_1);
     ENCODING2("ISO-8859-2", "ISO8859-2", pm_encoding_iso_8859_2);
     ENCODING2("ISO-8859-3", "ISO8859-3", pm_encoding_iso_8859_3);
diff --git a/test/prism/encoding_test.rb b/test/prism/encoding_test.rb
index 2c01f9e06d..562cfdb066 100644
--- a/test/prism/encoding_test.rb
+++ b/test/prism/encoding_test.rb
@@ -15,6 +15,7 @@ module Prism
       Encoding::EUC_JP,
       Encoding::GBK,
       Encoding::IBM437,
+      Encoding::IBM720,
       Encoding::ISO_8859_1,
       Encoding::ISO_8859_2,
       Encoding::ISO_8859_3,