Frank Alden Baum (1914 – 1944) was a grandson of L. Frank Baum.
Frank Alden was the second son of Baum's eldest son Frank Joslyn Baum and the younger brother of Joslyn Stanton Baum. In 1918 Baum Senior dedicated his twelfth Oz book, The Tin Woodman of Oz, to the four-year-old Frank.