The Whelen Engineering Company is an American corporation that designs and manufactures audio and visual warning equipment for automotive, aviation, and mass notification industries worldwide.

Whelen products are designed, manufactured, and assembled in two facilities in Chester, Connecticut and Charlestown, New Hampshire.

The four divisions of the company are as follows: An example product from the Mass Notification Products Division is the Whelen Hornet, which is an electronic civil defense siren introduced in 1995.

The siren's appearance is best described as a small dish on a square rotator platform, with the single driver located at the center of the horn.

[9] In the Whelen All-American Series, more than 10,000 drivers compete for championship at 55 NASCAR-sanctioned short tracks within the United States and Canada.