Janusz Majer (born September 25, 1946) is a Polish alpinist, himalayanist and traveler.

He is co-founder and co-owner (together with Artur Hajzer) of ADD Company, the owner of Alpinus brand (1993–2001), co-founder of Mount Company, the owner of the HiMountain brand which produces outdoor clothing and equipment and co-owner of the large chain of HiMountain shops in Poland.

Since 1976, Majer has continuously climbed abroad, inter alia in the Himalayas, Hindu Kush and Karakorum.

Between 1980 and 1992, a president of the Mountaineering Club in Katowice, which gathered the prominent alpinists and himalaists of that times: Jerzy Kukuczka, Krzysztof Wielicki, Ryszard Pawłowski, Artur Hajzer.

A vice-chairman of the Polish Alpine Association between 1987–1993; an honorary member of the Mountaineering Club in Katowice.