Elections were held in Cagayan Valley for seats in the House of Representatives of the Philippines on May 9, 2016.
The candidate with the most votes won that district's seat for the 17th Congress of the Philippines.
| Party | width=80px | Popular vote ! | width=50px | % ! | width=60px | Swing ! | width=40px | Seats won ! | width=45px | Change | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 423,442 | 4 | 2 | |||||||||
| 308,898 | 2 | 2 | |||||||||
| 179,141 | 2 | ||||||||||
| 224,215 | 1 | 1 | |||||||||
| 91,544 | 1 | 1 | |||||||||
| 63,574 | 0 | ||||||||||
| 19,391 | 0 | ||||||||||
| 3,619 | 0 | ||||||||||
| align=left colspan=2 | Valid votes | 1,313,824 | 10 | ||||||||
| align=left colspan=2 | Invalid votes | 245,086 | |||||||||
| align=left colspan=2 | Turnout | 1,558,910 | |||||||||
| align=left colspan=2 | Registered voters | ||||||||||
Henedina Abad is the incumbent.
Incumbent Salvacion Ponce Enrile is not running. Her husband former Representative Jack Enrile is her party's nominee.
Baby Aline Vargas-Alfonso is the incumbent.
Randolph Ting is the incumbent.
Incumbent Rodolfo Albano III is running.
Ana Cristina Go is the incumbent. She changed her party affiliation from Nacionalista to Liberal.
Napoleon Dy is the incumbent and is running unopposed.
Giorgidi Aggabao is term limited.
Incumbent Carlos M. Padilla is term-limited and is running for Governor. His wife, incumbent Governor Ruth Padilla is his party's nominee.
Incumbent Dakila Carlo Cua is running unopposed.