Mariya Takeuchi (竹内 まりや, Takeuchi Mariya?) (born March 20, 1955 in Shimane, Japan) is a Japanese singer and songwriter.

Takeuchi started her own career with a single "Modotte-Oide, Watashi no Jikan" in 1978. From the late 1970s to the early '80s, she have recorded 5 albums and several singles including top-ten hit "Fushigi na Peach Pie". Those materials have featured dozens of Japanese and North American distinguished songwriters, instrumentalists, and producers, such as David Foster, Jim Keltner, Jay Graydon, Steve Lukather, Jeff Porcaro, David Hungate, Kazuhiko Kato, Kunihiko Kase, Shigeru Suzuki, Takashi Matsumoto, and her future long-term partner Tatsuro Yamashita.

"Heart to Heart", one of her songs co-written by Roger Nichols and released in 1980, was recorded by the Carpenters two years later, and became the last recording for the late Karen Carpenter.

In 1981, Takeuchi married to a singer-songwriter Tatsuro Yamashita, and stopped her career temporarily owing to the pregnancy. After her comeback to the Japanese music industry in 1984, she have accomplished huge commercial success more than when she was single. From that year to the present, she have recorded 6 successful studio albums that mainly consisted by her self-penned songs, and all of them have reached #1 on the Japanese Oricon chart.

As a singer-songwriter, she have produced 8 top-ten hit singles on the Oricon, including "Single Again", "Kokuhaku", "Junai Rhapsody", "Konya wa Hearty Party" and her only #1 hit "Camouflage".

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