Ella Fitzgerald Sings the Johnny Mercer Song Book is a 1964 studio album by the American jazz singer Ella Fitzgerald, with the Nelson Riddle Orchestra, focusing on the songs of Johnny Mercer.

It was recorded in Los Angeles, California.

This is Fitzgerald's fifth and final collaboration with Riddle during her years on the Verve label.

It is also the last of the "Song Book" series of LPs dedicated to great American songwriters, which had begun in 1956 with Ella Fitzgerald Sings the Cole Porter Song Book.

For the 1964 Verve LP release; Verve V6-4067; Re-issued in 1984 on CD, Verve-PolyGram 823 247-2 Side One: Side Two: All lyrics by Johnny Mercer, composers between brackets.