The second USS Emma (SP-1223) was a United States Navy patrol vessel in service from 1917 to 1918. Emma was built as a private motorboat of the same name in 1891. In 1917, the U.S. Navy acquired her from her owner for use as a section patrol boat during World War I. She was placed in non-commissioned service as USS Emma (SP-1223). Assigned to the 5th Naval District, Emma served on patrol duties until sometime in 1918.