Eegonos, National Register listed house in Maine, United States.

Eegonos is a 2+1⁄2-story H-shaped summer house on the shore of Frenchman Bay, about 3 miles north of Bar Harbor's center. Boston architect Guy Lowell designed it in 1910 in Beaux Arts and Mediterranean Revival styles: masonry walls with stucco finish, a red tile roof, hipped side roofs and a side-gable central roof with four hip-roof dormers on both the land and ocean sides. A single-story porch with paired Ionic columns spans much of the southeastern section.

The first house on the site, called Sonogee, burned within two years of its construction. Mr. and Mrs. Walter G. Ladd then commissioned Boston architect Guy Lowell, and the present house was completed in 1910 and named Eegonos by reversing the earlier estate's name. It stayed in the Ladd family until 1949, housed a French language school from 1959 to 1975, and was listed on the National Register of Historic Places in 1980.

The name Eegonos reverses the spelling of Sonogee, the first house on the site, which burned within two years of construction. The Ladd family kept the house until 1949, and from 1959 to 1975 it served as dormitory housing for a French language school. In 2020 USA Today listed it as the grandest house in Maine.

Eegonos stands at 145 Eden Street, on the shore of Frenchman Bay about 3 miles (4.8 km) north of downtown Bar Harbor. It is a private residence, so the house and grounds are not open to visitors; the H-shaped facade, the paired Ionic porch columns and the red tile roof can be seen from the road.

The first house on the site, called Sonogee, burned within two years of being built; the Ladds then had Guy Lowell design the present house and named it Eegonos by reversing that earlier name. In 2020 USA Today listed it as the grandest house in Maine.