H. E. Narciso T. Castañeda is the current Ambassador Extraordinary and Plenipotentiary of the Republic of the Philippines to the Sultanate of Oman.

Ambassador Castañeda is a career diplomat of the Department of Foreign Affairs for the past 31 years. He has served in various offices and positions in the Home Office including a stint as Senior Special Assistant with the Office of the Vice President. He is a seasoned diplomat having been posted to Foreign Service posts of the Philippines in Washington D.C.; London, U.K.; Berne, Switzerland; Hongkong, S.A.R.; Jakarta, Indonesia; Paris, France; and Santiago, Chile.

Ambassador Castañeda presented his Letter of Credence to His Majesty Sultan Qaboos bin Said on 17 December 2013.

Ambassador Castañeda is married with one daughter.