An Excelsior list is a list filed by the employer within seven days after a union election has been directed by the National Labor Relations Board (NLRB), stating the names and addresses of all eligible bargaining unit employees. It is normally provided by the employer to the union within ten days after the election date has been set or agreed upon at the NLRB.

The NLRB has traditionally held that a union engaged in an organizing campaign is entitled to an Excelsior list, but only after it has filed an election petition with the NLRB. Since a petition cannot be filed without a showing of support from 30% of the employees, this rule effectively requires that unions obtain substantial support before they become entitled to a list of employee names and addresses.