thumb|Em, from [[Alexandre Benois' 1904 alphabet book]]
Em (М м; italics: М м or <span style="font-family: times, Times New Roman, serif; font-size: larger">М м</span>; italics: <span style="font-family: times, Times New Roman, serif; font-size: larger">М м</span>) is a letter of the Cyrillic script.