List of Famous people born on March 12nd

Sir Hew Dalrymple, 2nd Baronet was a Scottish politician and MP.

Darya Rubenovna Samarchants is a Ukrainian badminton player. She was the women's doubles champion at the 2013 Slovak Open partnered with Anastasiya Dmytryshyn.

Roy Sætre Khantatat, commonly known as Roy Khan, is a Norwegian singer-songwriter who is the lead singer for the Norwegian progressive metal band Conception and was the lead vocalist for the symphonic power metal band Kamelot from 1997 until his departure in 2011. He co-wrote most of Kamelot's songs with the band's guitarist and founder Thomas Youngblood during his tenure. Khan had retired from music in 2011 until 2018, when he released a new solo song on YouTube and announced the return of Conception.

Russell Earl Marker was an American chemist who invented the octane rating system when he was working at the Ethyl Corporation. Later in his career, he went on to found a steroid industry in Mexico when he successfully made semisynthetic progesterone from chemical constituents found in Mexican yams in a process known as Marker degradation. This eventually led to the development at Syntex of the combined oral contraceptive pill and synthetic cortisone – and to the development of the Mexican barbasco trade.