James Gordon MacArthur (December 8, 1937 – October 28, 2010) was an American actor with a long career in both movies and television. MacArthur's early work was predominantly in supporting roles in films. Later, he had a starring role as Danny "Danno" Williams, the reliable second-in-command of the fictional Hawaii State Police in the long-running television series Hawaii Five-O.
Born in Los Angeles, MacArthur was the adopted son of playwright Charles MacArthur and his wife, actress Helen Hayes. He grew up in Nyack, New York, along with his elder sister, the MacArthurs' biological daughter Mary, who died of polio in 1949. He was educated at Allen-Stevenson School in New York, and later at the Solebury School in New Hope, Pennsylvania, where he starred in basketball, football, and baseball.
In his final year at Solebury, MacArthur played guard on the football team; captained the basketball team; was president of his class, the student government, and the drama club; rewrote the school's constitution; edited the school paper, The Scribe; and played Scrooge in a local presentation of A Christmas Carol. He also started dating a fellow student, future actress Joyce Bulifant; they were married in November 1958 and divorced nine years later.

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