Alvin Childress (AP) _ Alvin Childress, an actor who held a title role in ''Amos 'n' Andy'' television comedy, died Saturday at the age of 78.

Childress first appeared on Broadway in ''Savage Rhythm'' in 1931. He later joined the Federal Theater when it was formed and worked as an instructor with the American Negro Theater. Childress played taxi driver-narrator Amos Jones on the popular but controversial CBS-TV program in the early 1950s. He also appeared on the TV series ''The Jeffersons'' and ''Sanford and Son.'' Childress' film credits include the ''The Day of the Locust,'' ''The Bingo Long Traveling All-Stars and Motor Kings'' and ''The Main Event.'' Donald Guy

CONCORD, Mass. (AP) - Donald C. Guy, an Asssociated Press photographer and newsman for nearly 30 years, died Saturday at age 72.

Guy joined the news cooperative's Boston bureau in 1943 as night editor of the photography department, after working briefly for The Standard-Times in New Bedford, Mass., and the Rutland (Vt.) Daily Herald. He became head of the department a few years later and held that position nearly three decades while writing news and science stories. In 1970 Guy became a regional reporter, retiring three years later.