Alonso R. del Portillo (born Alonso Rafael del Portillo-Leyva in 3 June 1960 in Havana, Cuba) is a Cuban-American genealogist and former aide to Congresswoman Ileana Ros-Lehtinen. Mr. del Portillo left Cuba when he was 13 months old during the Operation Peter Pan transport in July 1961 and did not return to Cuba until exactly 33 years later in July 1994. In 1988, he started to work with then Florida State Senator Ileana Ros-Lehtinen and when she was elected in 1989 to fill the US congressional seat of Claude Pepper he became her Assistant District Director. Later he became her immigration and State Department specialist.