Watford have been charged by the Football Association following an incident during their 1-1 draw with Ipswich on 21 December.
Several Hornets players surrounded referee Graham Scott after he judged Gabriele Angella had handled Frank Nouble's cross in the area.
Watford defender Joel Ekstrand was booked for his protests before David McGoldrick scored from the spot.
Watford have until 18:00 GMT on Monday to respond to the charge.
"Watford have been charged for failing to ensure its players conducted themselves in an orderly fashion and/or refrained from provocative behaviour," read a statement on the FA website.
Troy Deeney levelled for Watford in head coach Giuseppe Sannino's first match at the helm following the departure of Gianfranco Zola.