The Dr. Anna E. and Andrew A. Johnstone House (also known as the Royal House) is a historic house in Des Moines, Iowa, United States. Built in 1887, the Queen Anne-style house was listed on the National Register of Historic Places in 1996. It was a 10-room house, on a triple lot. Anna was a student of Dr. Summerfield S. Still, who ran an osteopathic hospital and school in downtown Des Moines, and lived in North Des Moines. The house was still in the family in 2013: it was owned and occupied by Jon Royal, a great-grandson of Anna E. and Andrew A Johnstone. Anna Johnstone died in 1848.