Susta (Nepali: सुस्ता) is a rural municipality located in Parasi District of Lumbini Province of Nepal.

[2][3] The rural municipality was established on 10 March 2017, fulfilling the requirement of the new constitution of Nepal in 2015, all old municipalities and villages (which were more than 3900 in number) were restructured into 753 new units, thus this RM came into existence.

[2][7] The rural municipality was established on 10 March 2017 as named Tribenisusta and it was part of Gandaki Province under Nawalpur District.

[7] the area of this municipality was 112.17 square kilometres (43.31 sq mi) and it had population of 43,797 individuals.

[2] Soon, the decision was taken to keep it in Lumbini Province under Parasi District but a big portion of Tribenisusta excluded from it and merged to Binayi Tribeni rural municipality of Gandaki Province.