"M" is a song written by Japanese singer Hamasaki Ayumi from her album I am... (2002). The lead single from the album and Hamasaki's nineteenth overall, "M" marked Hamasaki's increased creative control over her music, as it was the first song she composed, under the pseudonym "CREA".

The single was a commercial success; it peaked at the top spot on the Oricon weekly charts, selling over 500,000 units on its first day. Moreover, the single eventually sold over 1,000,000 copies over its seventeen-week run and became an RIAJ-certified million-seller; "M" also won the Japan Gold Disc Award for "Song of the Year".

Shortly after the release of her studio album Duty, Hamasaki began writing "M". Before then, Hamasaki's staff had composed the melodies; Hamasaki only wrote the lyrics. However, with "M", Hamasaki felt that none of the melodies composed by her staff fit her vision of the song. Consequently, she decided to compose the melody herself. She began work on an electronic keyboard; however, as she had little proficiency in the instrument, Hamasaki eventually resorted to singing the melody into a voice recorder.

Throughout the song, Hamasaki addresses "Maria". Hamasaki is ambiguous as to the identity of "Maria"; however, she has stated that the song was inspired by a story told to her by a friend about a saint named Mary. The story was pivotal in the shaping of the theme of the song, which, according to Hamasaki, is about a "woman who won't change with time". Finally, like other songs from I am..., Hamasaki explores the topics of couples and love.

According to Hamasaki, the melodies composed by her staff for "M" did not fit her image for the song because they were too "warm"—she had envisioned a melody with a "cold" feeling. That, according to Hamasaki, meant a melody that was "difficult to grasp" and started in a lower key before progressing to a higher key. The song is written in common time and begins in the key of C major before progressing to the key of C-sharp major. The song uses piano, electric guitar, triangle, and various stringed instruments.

"M", unlike Hamasaki's antecedent songs, does not follow the verse-chorus form; rather, the song opens with an introduction that is followed by a brief instrumental bridge that precedes two verses. The verses are followed by a pre-chorus after which comes an instrumental bridge; that is followed by a repetition of the pre-chorus and the verse. The chorus and a repetition of it follow; the chorus and its repetition are separated by another instrumental bridge. Finally, a second verse is sung before the repetition of the introduction, at which point the song ends.

The music video for "M", directed by Wataru Takeishi, opens with Hamasaki singing the introduction against a stained-glass window. The first instrumental bridge follows, during which is seen the exterior of a church. When the first verse starts, the doors of the church open and glowing particles sweep into the church; at the start of the second instrumental bridge, the particles merge and Hamasaki appears in a white gown at the intersection of the transept and the aisle. When the chorus starts, Hamasaki is seen outside the church (no longer in a gown) singing with her band; subsequent scenes switch between Hamasaki singing outside the church and standing inside. At the end of the video, the glowing particles sweep out of the church and the gown-clad Hamasaki disappears.

"M" debuted at the number-one position on the Oricon weekly charts on its first week of release, selling 541,350 copies. The single remained atop the charts the second week; however, the total sales for that week had dropped to 185,290. The sales rose the third week: the single sold 246,150 copies; however, it was only able to reach the number-two position, as Every Little Thing's single "Fragile/Jirenma" debuted that week with 278,120 copies. By the fourth week, "M" remained at the number-two position with 95,770 copies sold. It remained in the Top 10 the following three weeks, dropping from the number-five position to the number-seven position. It remained in the Top 30 for two more weeks; it reached the twenty-third position before dropping out. By the end of its nine-week run in the Oricon Top 30, "M" sold 1,222,340 copies, making it the best-selling single from I am... and adding to Hamasaki's million-selling singles.

Oricon Weekly Ranks & Sales

Week #Week RankSalesTotal Sales
1 1 541,350541,350
2 1 185,290726,640
3 2 246,150972,790
4 2 95,7701,068,560
5 5 58,7701,127,330
6 7 47,3701,174,700
7 12 28,3201,203,020
8 23 19,3201,222,340

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