1940 Philippine National Assembly special elections

Four special elections (known elsewhere as "by-elections") were held on December 10, 1940, for vacant seats in the National Assembly of the Philippines, the legislative body of the Commonwealth of the Philippines. These elections were conducted to fill the seats left vacant by the appointment of Pedro Sabido as manager of the National Abaca and other Fibers Corporation in Albay's third district, the deaths of Ruperto Montinola in Iloilo's second district and Ruperto Kapunan in Leyte's fifth district, and the resignation of Felipe Buencamino Jr. in Nueva Ecija's second district. The date of the special elections was set by President Manuel L. Quezon through Proclamation No. 625 signed on October 4, 1940.

The special elections were held on the same date as local elections for provincial, municipal and city officials.

Results
!colspan=2 style="background-color:#E9E9E9;text-align:left;" |Parties and coalitions ! style="background-color:#E9E9E9;text-align:right;" |% ! style="background-color:#E9E9E9;text-align:right;" |Seats The following were elected to fill the four vacant seats in the National Assembly of the Philippines, all retaining the control of the Nacionalista Party:
 * style="text-align:left;" colspan=2 |Nacionalista Party (Coalicion Nacionalista)
 * style="text-align:right;" |100.0
 * style="text-align:right;" |4
 * style="text-align:left;" colspan=2 |Young Philippines
 * style="text-align:right;" |0.0
 * style="text-align:right;" |0
 * style="text-align:left;" colspan=2 |Popular Philippines
 * style="text-align:right;" |0.0
 * style="text-align:right;" |0
 * style="text-align:left;" colspan=2 |Popular Front (Juan Sumulong Wing)
 * style="text-align:right;" |0.0
 * style="text-align:right;" |0
 * style="text-align:left;" colspan=2 |Popular Front (Pedro Abad Santos Wing)
 * style="text-align:right;" |0.0
 * style="text-align:right;" |0
 * colspan=2 style="text-align:left;background-color:#E9E9E9"|Total
 * width="75" style="text-align:right;background-color:#E9E9E9"|100.00
 * width="30" style="text-align:right;background-color:#E9E9E9"|4
 * style="text-align:left;" colspan=5 |Source: Philippine Legislature: 100 Years by Cesar Pobre.
 * }
 * colspan=2 style="text-align:left;background-color:#E9E9E9"|Total
 * width="75" style="text-align:right;background-color:#E9E9E9"|100.00
 * width="30" style="text-align:right;background-color:#E9E9E9"|4
 * style="text-align:left;" colspan=5 |Source: Philippine Legislature: 100 Years by Cesar Pobre.
 * }
 * style="text-align:left;" colspan=5 |Source: Philippine Legislature: 100 Years by Cesar Pobre.
 * }
 * Albay—3rd: Marcial O. Rañola
 * Iloilo—2nd: Oscar Ledesma
 * Leyte—5th: Atilano R. Cinco
 * Nueva Ecija—2nd: Gabriel Belmonte