Ultimate Diamond

{{Infobox album

| name = ULTIMATE DIAMOND

| type = studio

| artist = Nana Mizuki

| cover = Ultimate Diamond Cover.jpg

| alt =

| released = 3 June 2009

| recorded =

| venue =

| studio =

| genre = J-pop, pop rock, jazz, Eurobeat

| length = 65:26

| label = King Records

| producer =

| prev_title = Great Activity

| prev_year = 2007

| next_title = Impact Exciter

| next_year = 2010

| misc = {{Extra album cover

| header = Regular Edition

| type = studio

| cover = Ultimate Diamond Cover2.jpg

| border =

| alt =

| caption =

}}

{{Singles

| name = Ultimate Diamond

| type = studio

| single1 = Starcamp EP

| single1date = February 6, 2008

| single2 = Trickster

| single2date = October 1, 2008

| single3 = Shin'ai

| single3date = January 21, 2009

}}

}}

Ultimate Diamond is the seventh studio album released by Japanese voice actress and pop singer Nana Mizuki on June 3, 2009. It was released in two editions: a CD only edition and a limited CD+DVD edition.

The first press of the album has a 44-page booklet. A limited CD+DVD edition of the album included a DVD of a concert at the Shinjuku Koma Theater on October 11, 2008. At the concert, she covered two enka songs: Fuyumi Sakamoto's "Yozakura Oshichi" and Mitsuko Nakamura's "Kawachi Otoko Bushi".{{cite web|url=http://anime.biglobe.ne.jp/news/index?news_id=929|title=水樹奈々さん念願の『コマ劇場座長公演 水樹奈々 大いに唄う』開催(アニメイトTV)|publisher=BIGLOBE|date=2008-10-28|access-date=2009-06-03|language=ja}}{{Dead link|date=July 2018 |bot=InternetArchiveBot |fix-attempted=no }} The limited DVD included the two songs.{{cite web|url=http://www.hmv.co.jp/product/detail/3543876|title=Ultimate Diamond|publisher=HMV Japan|access-date=2009-06-03|language = ja}}

The album reached number 1 in Japan's Oricon weekly albums charts for the week of June 15, 2009, and became the first album from a voice actress to accomplish that feat since the creation of Oricon.{{cite web|url=http://www.oricon.co.jp/news/rankmusic/66771/full/|script-title=ja:デビュー9年目の水樹奈々、声優史上初の首位獲得に「夢のような出来事」|publisher=Oricon|date=2009-06-09|access-date=2009-06-10|language = ja}}