Administrative Professionals' Day (also known as Secretaries Day or Admin Day ) is an unofficial secular holiday observed in several countries to recognize the work of secretaries, administrative assistants, receptionists, and other administrative support professionals. In North America, it is celebrated on the Wednesday of the last full week of April (April 25 in 2012). In much of Europe it is celebrated on the third Thursday in April^[1] (April 19 in 2012).

The idea began with Mary Barrett, president of the National Secretaries Association, now called IAAP (International Association of Administrative Professionals), and C. King Woodbridge, president of Dictaphone Corporation. They served on a council addressing a national shortage of skilled office workers. Together with Harry Klemfuss, public relations account executive at Young & Rubicam, they originated the idea for a National Secretaries Week.