James Joseph "Nixey" Callahan (March 18, 1874 – October 4, 1934) was an American pitcher and left fielder in Major League Baseball for the Philadelphia Phillies, Chicago Colts/Orphans, and Chicago White Sox. He also managed the White Sox, as well as the Pittsburgh Pirates. Born in Fitchburg, Massachusetts, he died at age 60 in Boston.

Callahan may refer to:

Terrius Callahan (raised in Cartersville, Georgia) is an American student and football player.

This a detailed discography of American singer-songwriter Bill Callahan . All of his work was released under the alias Smog, except where noted.

John Callahan may refer to:

Patti Callahan Henry is an American novelist. She is the New York Times bestselling author of fifteen books, including the historical novel, *BECOMING MRS. LEWIS – The Improbable Love Story of Joy Davidman and C.S. Lewis * and her upcoming work of contemporary Southern fiction *THE FAVORITE DAUGHTER *, coming June 4, 2019.