| Election Name: | 2019 Osaka 12th district by-election |
| Country: | Japan |
| Type: | by-election |
| Seats For Election: | Osaka 12th district |
| Ongoing: | no |
| Previous Election: | 2017 Japanese general election |
| Previous Year: | 2017 |
| Next Election: | 2021 Japanese general election |
| Next Year: | 2021 |
| Election Date: | 21 April 2019 |
| Turnout: | 47.00% |
| Image1: | Fumitake Fujita 2022-6-26(cropped).jpg |
| Nominee1: | Fumitake Fujita |
| Party1: | Nippon Ishin no Kai |
| Popular Vote1: | 60,341 |
| Percentage1: | 38.49% |
| Nominee2: | Shinpei Kitagawa |
| Party2: | Liberal Democratic Party (Japan) |
| Popular Vote2: | 47,025 |
| Percentage2: | 30.00% |
| Image3: | Shinji Tarutoko.jpg |
| Nominee3: | Shinji Tarutoko |
| Party3: | Independent politician |
| Popular Vote3: | 35,358 |
| Percentage3: | 22.56% |
| Representative | |
| Before Election: | Tomokatsu Kitagawa |
| Before Party: | Liberal Democratic Party (Japan) |
| After Election: | Fumitake Fujita |
| After Party: | Nippon Ishin no Kai |
A by-election for the Osaka 12th district in the Japanese House of Representatives was held on 21 April 2019.[1] The by-election was called following the death of the incumbent member Tomokatsu Kitagawa, a member of the Liberal Democratic Party (LDP), from peritonitis on 26 December 2018. Kitagawa had served the district almost continuously since 2005 (except between 2009–12) and defended the seat by a narrow 4.4% margin in the 2017 election, making the seat a potential battleground. The by-election was held on the same day with the second round of the unified local elections and another House by-election for the Okinawa 3rd district.
The by-election was won by Nippon Ishin no Kai's Fujita Fumitake, marking a gain for the party.[2]