Shinjuku, Tokyo held a local election for the city assembly on April 22, 2007 as part of the 2007 Japanese unified local elections.
|-! style="background-color:#E9E9E9;text-align:left;" |Parties! style="background-color:#E9E9E9;text-align:right;" |Votes! style="background-color:#E9E9E9;text-align:right;" |%! style="background-color:#E9E9E9;text-align:right;" |Seats|-| style="text-align:left;" |Liberal Democratic Party (自由民主党, Jiyū Minshutō)| style="text-align:right;" | 23,018| style="text-align:right;" | | style="text-align:right;" | 10|-| style="text-align:left;" |New Komeito Party (公明党, Kōmeitō)| style="text-align:right;" | 19,806| style="text-align:right;" | | style="text-align:right;" | 9|-| style="text-align:left;" |Japanese Communist Party (日本共産党, Nihon Kyōsan-tō)| style="text-align:right;" | 15,642| style="text-align:right;" | | style="text-align:right;" | 8|-| style="text-align:left;" |Democratic Party of Japan (民主党, Minshutō)| style="text-align:right;" | 10,990| style="text-align:right;" | | style="text-align:right;" | 5|-| style="text-align:left;" |New Socialist Party (新社会党, Shin-Shakaitō)| style="text-align:right;" | 2,358| style="text-align:right;" | | style="text-align:right;" | 1|-| style="text-align:left;" |Social Democratic Party (社民党 Shamin-tō)| style="text-align:right;" | 2,108| style="text-align:right;" | | style="text-align:right;" | 1|-| style="text-align:left;" | Independents| style="text-align:right;" | 8,216| style="text-align:right;" | | style="text-align:right;" | 4|-|style="text-align:left;background-color:#E9E9E9"|Total (turnout 40.15%)|width="75" style="text-align:right;background-color:#E9E9E9"| N/A|width="30" style="text-align:right;background-color:#E9E9E9"| 100.00|width="30" style="text-align:right;background-color:#E9E9E9"| 38|-| style="text-align:left;" colspan=4 |Source:http://www.senkyo.janjan.jp/election/2007/13/00005595.html |}