The fixture will take place on Thursday 10 April at Vicarage Road with kick-off scheduled for 19:00 (UK).
For fans outside of the United Kingdom, the game will also be available to watch live on television in the United States (ESPN), Canada (Sportsnet) and the Caribbean (Rush) for fans in those countries.
Oliver Reiss’s youngsters earned our place in the last four with an impressive 6-0 quarter-final win away at West Brom having already beaten Crystal Palace, Millwall and Leeds.
Watford, meanwhile, reached the last-four with victories over Oxford, Crewe, Tottenham and Southampton.
The two clubs met in the FA Youth Cup last season when we recorded a 2-0 third round victory away from home on the way to lifting the trophy.
Should City get past the Hornets again, we will face the winner of the other semi-final - Aston Villa or Manchester United - away with a time and date to be confirmed.
