Ratra House (Irish: Teach Ráth an tSratha), sometimes called Little Ratra, is one of the minor state residences located in Dublin's Phoenix Park. Until 2006 it was used as the Civil Defence School.The building, which dates from the early 19th century, was originally known as the Little Lodge. From 1876, it became the official residence of the Private Secretary to the Lord Lieutenant of Ireland, who lived out of season in the next door Viceregal Lodge.