Leland Jensen (22 August 1914 – 6 August 1996) was the leader of a small apocalyptic cult called the Baháʼís Under the Provisions of the Covenant (BUPC). Jensen was originally a member of the mainstream Baháʼí Faith until he was excommunicated in 1960 for supporting Mason Remey's attempt at schism. He later left Remey's group due to infighting and began teaching that he would re-establish the Baháʼí Faith after a nuclear holocaust, which he predicted would occur in 1980. At its peak, his movement had 150-200 followers, mostly in Montana, but declined in size significantly by 1990 and beyond.

Jensen and his followers gained national media attention for their commitment to his prophecy of nuclear annihilation on 29 April 1980. They built fallout shelters, distributed leaflets, and urged others to take heed of the warning. Due to the "painfully obvious" nature of the failed prophecy, they became a case study in cognitive dissonance.