diff --git a/README.md b/README.md
index e3e67d9..4d76275 100644
--- a/README.md
+++ b/README.md
@@ -119,6 +119,7 @@ const (
     LocaleCsCZ = "cs_CZ" // Czech (Czech Republic)
     LocaleSlSI = "sl_SI" // Slovenian (Slovenia)
     LocaleLtLT = "lt_LT" // Lithuanian (Lithuania)
+    LocaleThTH = "th_TH" // Thai (Thailand)
 )
 ```
 
diff --git a/default_formats.go b/default_formats.go
index c32b92d..b874096 100644
--- a/default_formats.go
+++ b/default_formats.go
@@ -256,6 +256,13 @@ const (
 	DefaultFormatLtLTShort    = "2006-01-02"
 	DefaultFormatLtLTDateTime = "2006-01-02, 15:04"
 	DefaultFormatLtLTTime     = "15:04"
+
+	DefaultFormatThTHFull     = "Monday ที่ 2 January 2006" // Thai (Thailand)
+	DefaultFormatThTHLong     = "วันที่ 2 January 2006"
+	DefaultFormatThTHMedium   = "2 Jan 2006"
+	DefaultFormatThTHShort    = "02/01/2006"
+	DefaultFormatThTHDateTime = "02/01/2006 15:04"
+	DefaultFormatThTHTime     = "15:04"
 )
 
 // FullFormatsByLocale maps locales to the'full' date formats for all
@@ -297,6 +304,7 @@ var FullFormatsByLocale = map[Locale]string{
 	LocaleCsCZ: DefaultFormatCsCZFull,
 	LocaleUkUA: DefaultFormatUkUAFull,
 	LocaleLtLT: DefaultFormatLtLTFull,
+	LocaleThTH: DefaultFormatThTHFull,
 }
 
 // LongFormatsByLocale maps locales to the 'long' date formats for all
@@ -338,6 +346,7 @@ var LongFormatsByLocale = map[Locale]string{
 	LocaleCsCZ: DefaultFormatCsCZLong,
 	LocaleUkUA: DefaultFormatUkUALong,
 	LocaleLtLT: DefaultFormatLtLTLong,
+	LocaleThTH: DefaultFormatThTHLong,
 }
 
 // MediumFormatsByLocale maps locales to the 'medium' date formats for all
@@ -379,6 +388,7 @@ var MediumFormatsByLocale = map[Locale]string{
 	LocaleCsCZ: DefaultFormatCsCZMedium,
 	LocaleUkUA: DefaultFormatUkUAMedium,
 	LocaleLtLT: DefaultFormatLtLTMedium,
+	LocaleThTH: DefaultFormatThTHMedium,
 }
 
 // ShortFormatsByLocale maps locales to the 'short' date formats for all
@@ -420,6 +430,7 @@ var ShortFormatsByLocale = map[Locale]string{
 	LocaleCsCZ: DefaultFormatCsCZShort,
 	LocaleUkUA: DefaultFormatUkUAShort,
 	LocaleLtLT: DefaultFormatLtLTShort,
+	LocaleThTH: DefaultFormatThTHShort,
 }
 
 // DateTimeFormatsByLocale maps locales to the 'DateTime' date formats for
@@ -461,6 +472,7 @@ var DateTimeFormatsByLocale = map[Locale]string{
 	LocaleCsCZ: DefaultFormatCsCZDateTime,
 	LocaleUkUA: DefaultFormatUkUADateTime,
 	LocaleLtLT: DefaultFormatLtLTDateTime,
+	LocaleThTH: DefaultFormatThTHDateTime,
 }
 
 // TimeFormatsByLocale maps locales to the 'Time' date formats for
@@ -502,4 +514,5 @@ var TimeFormatsByLocale = map[Locale]string{
 	LocaleCsCZ: DefaultFormatCsCZTime,
 	LocaleUkUA: DefaultFormatUkUATime,
 	LocaleLtLT: DefaultFormatLtLTTime,
+	LocaleThTH: DefaultFormatThTHTime,
 }
diff --git a/format_th_th.go b/format_th_th.go
new file mode 100644
index 0000000..c83d968
--- /dev/null
+++ b/format_th_th.go
@@ -0,0 +1,84 @@
+package monday
+
+import "strings"
+
+// ============================================================
+// Format rules for "th_TH" locale: Thai (Thailand)
+// ============================================================
+
+var longDayNamesThTH = map[string]string{
+	"Sunday":    "วันอาทิตย์",
+	"Monday":    "วันจันทร์",
+	"Tuesday":   "วันอังคาร",
+	"Wednesday": "วันพุธ",
+	"Thursday":  "วันพฤหัสบดี",
+	"Friday":    "วันศุกร์",
+	"Saturday":  "วันเสาร์",
+}
+
+var shortDayNamesThTH = map[string]string{
+	"Sun": "อา.",
+	"Mon": "จ.",
+	"Tue": "อ.",
+	"Wed": "พ.",
+	"Thu": "พฤ.",
+	"Fri": "ศ.",
+	"Sat": "ส.",
+}
+
+var longMonthNamesThTH = map[string]string{
+	"January":   "มกราคม",
+	"February":  "กุมภาพันธ์",
+	"March":     "มีนาคม",
+	"April":     "เมษายน",
+	"May":       "พฤษภาคม",
+	"June":      "มิถุนายน",
+	"July":      "กรกฎาคม",
+	"August":    "สิงหาคม",
+	"September": "กันยายน",
+	"October":   "ตุลาคม",
+	"November":  "พฤศจิกายน",
+	"December":  "ธันวาคม",
+}
+
+var shortMonthNamesThTH = map[string]string{
+	"Jan": "ม.ค.",
+	"Feb": "ก.พ.",
+	"Mar": "มี.ค.",
+	"Apr": "เม.ย.",
+	"May": "พ.ค.",
+	"Jun": "มิ.ย.",
+	"Jul": "ก.ค.",
+	"Aug": "ส.ค.",
+	"Sep": "ก.ย.",
+	"Oct": "ต.ค.",
+	"Nov": "พ.ย.",
+	"Dec": "ธ.ค.",
+}
+
+func parseFuncThCommon(locale Locale) internalParseFunc {
+	return func(layout, value string) string {
+		// This special case is needed because th_TH... contains month and day names
+		// that consist of dots, and special character. Example: "February" = "กุมภาพันธ์", "Feb" = "ก.พ."
+		//
+		// This means that probably default time package layout IDs like 'January' or 'Jan'
+		// shouldn't be used in th_TH. But this is a time-compatible package, so someone
+		// might actually use those and we need to replace those before doing standard procedures.
+		for k, v := range knownMonthsShortReverse[locale] {
+			value = strings.Replace(value, k, v, -1)
+		}
+		for k, v := range knownDaysShortReverse[locale] {
+			value = strings.Replace(value, k, v, -1)
+		}
+		for k, v := range knownMonthsLongReverse[locale] {
+			value = strings.Replace(value, k, v, -1)
+		}
+		for k, v := range knownDaysLongReverse[locale] {
+			value = strings.Replace(value, k, v, -1)
+		}
+
+		return commonFormatFunc(value, layout,
+			knownDaysShortReverse[locale], knownDaysLongReverse[locale],
+			knownMonthsShortReverse[locale], knownMonthsLongReverse[locale], knownPeriods[locale])
+	}
+}
diff --git a/locale.go b/locale.go
index 518bacb..6df2e97 100644
--- a/locale.go
+++ b/locale.go
@@ -46,6 +46,7 @@ const (
 	LocaleCsCZ = "cs_CZ" // Czech (Czech Republic)
 	LocaleSlSI = "sl_SI" // Slovenian (Slovenia)
 	LocaleLtLT = "lt_LT" // Lithuanian (Lithuania)
+	LocaleThTH = "th_TH" // Thai (Thailand)
 )
 
 // ListLocales returns all locales supported by the package.
@@ -89,5 +90,6 @@ func ListLocales() []Locale {
 		LocaleCsCZ,
 		LocaleSlSI,
 		LocaleLtLT,
+		LocaleThTH,
 	}
 }
diff --git a/monday.go b/monday.go
index 5e4a034..e12783d 100644
--- a/monday.go
+++ b/monday.go
@@ -48,6 +48,7 @@ var internalFormatFuncs = map[Locale]internalFormatFunc{
 	LocaleCsCZ: createCommonFormatFunc(LocaleCsCZ),
 	LocaleSlSI: createCommonFormatFunc(LocaleSlSI),
 	LocaleLtLT: createCommonFormatFuncWithGenitive(LocaleLtLT),
+	LocaleThTH: createCommonFormatFunc(LocaleThTH),
 }
 
 // internalParseFunc is a preprocessor for default time.ParseInLocation func
@@ -93,6 +94,7 @@ var internalParseFuncs = map[Locale]internalParseFunc{
 	LocaleCsCZ: createCommonParseFunc(LocaleCsCZ),
 	LocaleSlSI: createCommonParseFunc(LocaleSlSI),
 	LocaleLtLT: createCommonParsetFuncWithGenitive(LocaleLtLT),
+	LocaleThTH: parseFuncThCommon(LocaleThTH),
 }
 
 var knownDaysShort = map[Locale]map[string]string{}           // Mapping for 'Format', days of week, short form
@@ -365,6 +367,12 @@ func fillKnownWords() {
 	fillKnownMonthsShort(shortMonthNamesLtLT, LocaleLtLT)
 	fillKnownMonthsGenitiveLong(longMonthNamesGenitiveLtLT, LocaleLtLT)
 	fillKnownMonthsGenitiveShort(shortMonthNamesGenitiveLtLT, LocaleLtLT)
+
+	// Th_TH: Thai (Thailand)
+	fillKnownDaysLong(longDayNamesThTH, LocaleThTH)
+	fillKnownDaysShort(shortDayNamesThTH, LocaleThTH)
+	fillKnownMonthsLong(longMonthNamesThTH, LocaleThTH)
+	fillKnownMonthsShort(shortMonthNamesThTH, LocaleThTH)
 }
 
 func fill(src map[string]string, dest map[Locale]map[string]string, locale Locale) {
diff --git a/monday_test.go b/monday_test.go
index f53c563..cc7de78 100644
--- a/monday_test.go
+++ b/monday_test.go
@@ -352,6 +352,14 @@ var formatTests = []FormatTest{
 	{LocaleSlSI, time.Date(2013, 5, 13, 0, 0, 0, 0, time.UTC), "2 Jan 2006", "13 maj 2013"},
 	{LocaleSlSI, time.Date(0, 5, 1, 0, 0, 0, 0, time.UTC), "January", "maj"},
 	{LocaleSlSI, time.Date(0, 5, 13, 0, 0, 0, 0, time.UTC), "2 January", "13 maj"},
+
+	{LocaleThTH, time.Date(2022, 7, 8, 0, 0, 0, 0, time.UTC), "Mon Jan 2 2006", "ศ. ก.ค. 8 2022"},
+	{LocaleThTH, time.Date(2022, 7, 8, 0, 0, 0, 0, time.UTC), "Monday Jan 2 2006", "วันศุกร์ ก.ค. 8 2022"},
+	{LocaleThTH, time.Date(2022, 2, 1, 0, 0, 0, 0, time.UTC), "Monday January 02 2006", "วันอังคาร กุมภาพันธ์ 01 2022"},
+	{LocaleThTH, time.Date(2022, 5, 13, 0, 0, 0, 0, time.UTC), "2006. 2 January.", "2022. 13 พฤษภาคม."},
+	{LocaleThTH, time.Date(2022, 5, 13, 0, 0, 0, 0, time.UTC), "2 Jan 2006", "13 พ.ค. 2022"},
+	{LocaleThTH, time.Date(0, 5, 1, 0, 0, 0, 0, time.UTC), "January", "พฤษภาคม"},
+	{LocaleThTH, time.Date(0, 5, 13, 0, 0, 0, 0, time.UTC), "2 January", "13 พฤษภาคม"},
 }
 
 func TestFormat(t *testing.T) {