"We thank Tom for his contributions to the organization and wish him all the best in his future endeavors," the club said in a statement coinciding with the extension of general manager Pierre Dorion's contract.
Anselmi held the job for just over a year, having been officially hired by the club on Jan. 25, 2017.
The Senators, of course, recently reached a deal in principle to be part of the redevelopment of LeBreton Flats, a downtown Ottawa neighborhood where the club wants to build a new arena.
Prior to working for the Senators, Anselmi served first as chief operating officer and then president of Maple Leaf Sports & Entertainment (MLSE), and even further back, he was vice president and general manager of arena operations for Orca Bay Sports and Entertainment (now Canucks Sports & Entertainment).
There's no indication at this point as to why Anselmi left his post, or who his replacement might be.