Robert Washington Fyan (March 11, 1835 – July 28, 1896) was a U.S. Representative and soldier from Missouri. Born in Bedford Springs, Pennsylvania, Fyan attended the common schools. He studied law and was admitted to the bar in 1858; commencing practice in Marshfield, Missouri.He became the County attorney in 1859. In June 1861 he entered the Union Army to fight in the American Civil War. He served in Colonel Hampton's regiment, the Webster County Home Guards, the 24th Missouri Infantry and the 46th Missouri Infantry regiments.After the war in 1865 and 1866 he served as Circuit attorney and afterwards as Circuit judge of the 14th judicial circuit of Missouri from April 1866 to January 1883.