U.S. House seat for California's 33rd congressional district. Representatives serve two-year terms.

7 candidates filed, 2 active for the 2026 House election in California District 33. General election on Nov 3, 2026.
| Year | Winner | Result | Runner-Up | Total Votes |
|---|---|---|---|---|
| 2024 | Pete Aguilar D | 58.8% | 233,275 | |
| 2022 | Pete Aguilar D | 57.7% | 132,707 | |
| 2020 | Ted Lieu D | 67.6% | 380,428 | |
| 2018 | Ted W Lieu D | 70.0% | 312,860 | |
| 2016 | Ted Lieu D | 66.4% | 330,219 | |
| 2014 | Ted Lieu D | 59.2% | 183,031 | |
| 2012 | Henry A Waxman D | 54.0% | 318,520 | |
| 2010 | Karen Bass D | 86.1% | 153,332 | |
| 2008 | Diane E Watson D | 87.6% | 213,460 | |
| 2006 | Diane E Watson D | 100.0% | 113,715 | |
| 2004 | Diane E Watson D | 88.6% | 188,314 | |
| 2002 | Diane E Watson D | 82.5% | 118,449 | |
| 2000 | Lucille Roybal-Allard D | 84.5% | 71,571 | |
| 1998 | Lucille Roybal-Allard D | 87.2% | 49,674 | |
| 1996 | Lucille Roybal-Allard D | 82.1% | 57,828 |