Prince Nirajan Bir Bikram Shah Dev (; 6 November 1978 – 1 June 2001) was a prince of Nepal, the younger son of King Birendra and Queen Aishwarya of Nepal. He and his parents were killed during the 1 June 2001 Nepalese royal massacre.
He was educated at Budhanilkantha School, Kathmandu and Eton College and had a degree of B.B.A. from Kathmandu College of Management. He was interested in sports, especially swimming.
The name Nirajan means "One without fault; perfect in all forms".
Nirajan was among the victims of the Nepalese royal massacre on 1 June 2001 along with his father, mother, sister, brother and other close royal relatives.