William Mendiola Castro
Ballot No. 15On the ballot as “Wil”
RepublicanSenator
Unverified
This profile was compiled from public records and has not yet been verified by William. Candidates can confirm it and add their positions here. Sources are listed below.
Background
William "Wil" Mendiola Castro is a Guam Republican politician and educator who served as a senator (2017–2021), including as Minority Leader of the 35th Legislature, and was the Republican candidate for Guam's U.S. House seat in 2020. He later served as Chief of Staff to CNMI Governor Ralph Torres.
Quick facts
Office soughtSenator
PartyRepublican
IncumbentNo
On the ballotPrimary — August 1, 2026
Number on the ballotNo. 15
Ballot name“Wil”
Sources
Compiled from public sources; not verified by the candidate. Spotted an error? Tell us.
Are you William Mendiola Castro or part of their campaign? Complete your candidate questionnaire to fill out this profile. Every candidate gets the same uniform format, free of charge.