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diff --git a/languages/classes/LanguageOs.php b/languages/classes/LanguageOs.php
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+<?php
+
+/** Ossetian (Ирон)
+ *
+ * @author Soslan Khubulov
+ *
+ * @ingroup Language
+ */
+class LanguageOs extends Language {
+
+	/**
+	 * Convert from the nominative form of a noun to other cases
+	 * Invoked with {{grammar:case|word}}
+	 *
+	 * Depending on word there are four different ways of converting to other cases.
+	 * 1) Word consist of not cyrillic letters or is an abbreviation.
+	 * 		Then result word is: word + hyphen + case ending.
+	 *
+	 * 2) Word consist of cyrillic letters.
+	 * 2.1) Word is in plural.
+	 * 		Then result word is: word - last letter + case ending. Ending of allative case here is 'æм'.
+	 *
+	 * 2.2) Word is in singular.
+	 * 2.2.1) Word ends on consonant.
+	 * 		Then result word is: word + case ending.
+	 *
+	 * 2.2.2) Word ends on vowel.
+	 * 		Then result word is: word + 'й' + case ending for cases != allative or comitative
+	 * 		and word + case ending for allative or comitative. Ending of allative case here is 'æ'.
+	 *
+	 * @param $word string
+	 * @param $case string
+	 * @return string
+	 */
+	function convertGrammar( $word, $case ) {
+		global $wgGrammarForms;
+		if ( isset( $wgGrammarForms['os'][$case][$word] ) ) {
+			return $wgGrammarForms['os'][$case][$word];
+		}
+		# Ending for allative case
+		$end_allative = 'мæ';
+		# Variable for 'j' beetwen vowels
+		$jot = '';
+		# Variable for "-" for not Ossetic words
+		$hyphen = '';
+		# Variable for ending
+		$ending = '';
+
+
+		# CHecking if the $word is in plural form
+		if ( preg_match( '/тæ$/u', $word ) ) {
+			$word = mb_substr( $word, 0, -1 );
+			$end_allative = 'æм';
+		}
+		# Works if $word is in singular form.
+		# Checking if $word ends on one of the vowels: е, ё, и, о, ы, э, ю, я.
+		elseif ( preg_match( "/[аæеёиоыэюя]$/u", $word ) ) {
+			$jot = 'й';
+		}
+		# Checking if $word ends on 'у'. 'У' can be either consonant 'W' or vowel 'U' in cyrillic Ossetic.
+		# Examples: {{grammar:genitive|аунеу}} = аунеуы, {{grammar:genitive|лæппу}} = лæппуйы.
+		elseif ( preg_match( "/у$/u", $word ) ) {
+			if ( !preg_match( "/[аæеёиоыэюя]$/u", mb_substr( $word, -2, 1 ) ) )
+				$jot = 'й';
+		} elseif ( !preg_match( "/[бвгджзйклмнопрстфхцчшщьъ]$/u", $word ) ) {
+			$hyphen = '-';
+		}
+
+		switch ( $case ) {
+			case 'genitive': $ending = $hyphen . $jot . 'ы'; break;
+			case 'dative': $ending = $hyphen . $jot . 'æн'; break;
+			case 'allative': $ending = $hyphen . $end_allative; break;
+			case 'ablative':
+				if ( $jot == 'й' ) {
+					$ending = $hyphen . $jot . 'æ'; break;
+				}
+				else {
+					$ending = $hyphen . $jot . 'æй'; break;
+				}
+			case 'inessive': break;
+			case 'superessive': $ending = $hyphen . $jot . 'ыл'; break;
+			case 'equative': $ending = $hyphen . $jot . 'ау'; break;
+			case 'comitative': $ending = $hyphen . 'имæ'; break;
+		}
+		return $word . $ending;
+	}
+}