The 28-year-old Cameroon international joined Watford from Udinese in July 2015 and made 32 Premier League appearances last season.
A statement published on Watford's official website confirmed Nyom, who previously spent six years on loan from Udinese at Granada, had extended his deal.
New Hornets boss Walter Mazzarri has signed Isaac Success, Christian Kabasele, Brice Dja Djedje, Jerome Sinclair and Juan Camilo Zuniga this summer
Source : PA
Source: PA