Lucy Seki (27 March 1939 – 23 June 2017^[1]) was a Brazilian linguist specializing in indigenous languages of the Americas. She authored a grammar of the Kamayurá language.

Lucy Seki had a Master's and Ph.D. in linguistics from the Patrice Lumumba University in Moscow. She was also awarded a Bachelor in history by the Federal University of Minas Gerais, and did post-doctorate studies at the University of Texas at Austin. She was a full professor at the State University of Campinas (UNICAMP), Brazil. In 2010, she was elected an honorary member of the Linguistic Society of America for her outstanding contribution to the field.^[2]