Princess Ileana of Romania, also known as Mother Alexandra (5 January 1909 – 21 January 1991), was the youngest daughter of King Ferdinand I of Romania and his consort, Queen Marie. She was a great-granddaughter of Emperor Alexander II of Russia, Queen Maria II of Portugal, and Queen Victoria of the United Kingdom. She was born as Her Royal Highness Princess Ileana of Romania, Princess of Hohenzollern-Sigmaringen.

Ileana was born in Bucharest on 5 January 1909, the youngest daughter of Queen Marie of Romania and King Ferdinand I of Romania. Ileana had four older siblings: Carol, Elisabeth (later Queen of Greece), Princess Maria (later Queen of Yugoslavia), and Nicholas; and a younger brother Mircea.

Her mother wrote in her memoirs:

Ileana  from  her  earliest  infancy  had  an  earnestness  about  her  which the  other  four  did  not  possess. Her  large  dark  blue  eyes  looked  at  you with  deep  inquiry  and  the  child  seemed  to  understand  your  every  emotion with  almost  uncanny  lucidity.

Ileana  was  naturally  well-behaved; Ileana, as  is  so  seldom  the  case, was  born  with  the  law  within  her, it  was  never  necessary  to  teach  Ileana the  difference  between  right  and  wrong; Ileana  knew. But  this  did  not make  of  her  a prig, she  was  a gay, happy  child, full  of  life  and  high spirits, and  when  Mircea  appeared  early  in  the  year  1913, Ileana  loved him  with  motherly  ardour  and  Mircea  adored  Ileana  more  than  anyone on  this  earth; more  than  his  mother, more  than  his  nurse.

Before her marriage, Ileana was the organizer and Chief of the Romanian Girl Guide Movement.

Later, Princess Ileana was involved in Guiding in Austria and served as president of the Austrian Girl Guides. From 1935 until Girl Guiding and Scouting were banned in 1938 after the Anschluss.

Ileana was the organizer of the Girl Reserves of the Red Cross, and of the first school of Social Work in Romania.