"Don't You Know How Much I Love You" is a song written by Michael Stewart and Dan Williams, and recorded by American country music artist Ronnie Milsap. It was released in July 1983 as the second single from the album Keyed Up. "Don't You Know How Much I Love You" was Ronnie Milsap's twenty-third number one country hit. The single went to number one for one week and spent a total of twelve weeks on the country chart.