Seiji Osaka

{{short description|Japanese politician}}

{{Expand Japanese|topic=bio|逢坂誠二|date=October 2017}}

{{Infobox officeholder

| name = Seiji Ōsaka

| native_name = {{nobold|逢坂 誠二}}

| native_name_lang = ja

| image = Seiji Ōsaka 201101 (cropped 3).jpg

| caption = Official portrait, 2011

| office = Deputy Leader of the
Constitutional Democratic Party

| leader = Kenta Izumi

| term_start = 30 November 2021

| term_end =

| predecessor = Akira Nagatsuma

| successor =

| office1 = Member of the House of Representatives

| term_start1 = 15 December 2014

| term_end1 =

| constituency1 = Hokkaido 8th

| predecessor1 = Kazuo Maeda

| successor1 =

| term_start2 = 12 September 2005

| term_end2 = 16 November 2012

| predecessor2 = Multi-member district

| successor2 = Kazuo Maeda

| constituency2 = Hokkaido PR (2005–2009)
Hokkaido 8th (2009–2012)
Hokkaido 8th (2014-present)

| office3 = Mayor of Niseko

| term_start3 = November 1994

| term_end3 = 29 August 2005

| predecessor3 = Tomio Watanabe

| successor3 = Ryūichi Satō

| birth_date = {{birth date and age|df=yes|1959|4|24}}

| birth_place = Niseko, Hokkaido, Japan

| death_date =

| death_place =

| alma_mater = Hokkaido University

| party = CDP (since 2017)

| otherparty = Independent (1994–2005)
DPJ (2005–2016)
DP (2016–2017)

| website = [https://ohsaka.jp/ Official website]

}}

{{nihongo|Seiji Osaka|逢坂 誠二|Ōsaka Seiji|extra=born April 24, 1959}} is a Japanese politician of the Constitutional Democratic Party of Japan (CDP), a member of the House of Representatives in the Diet (national legislature).{{Cite news| title = Opposition grills gov't over Kake vet school approval, calling it non-qualified| publisher = Mainichi Shimbun| date = 16 November 2017| url = http://mainichi.jp/english/articles/20171116/p2a/00m/0na/018000c}}