Donald David Guard (October 19, 1934 – March 22, 1991) was an American folk singer, songwriter, arranger and recording artist.

He was particularly attracted to the unique rhythmic sounds of finger-picked slack-key ukulele and guitar music masterfully performed by the many of his neighbors and beach boys.

Along with all his other classmates, Guard early on learned to play Hawaii's ubiquitous ukulele in a 7th grade junior high school music class required of all students.

It was in that class that Punahou's young 7th graders like Guard and his future Kingston Trio partner-to-be Shane learned the basics of playing the ukulele.

Still appreciating Caribbean rhythms and vocals, but given his more eclectic folk music interests, Guard changed the name of the four Calypsonians to the Kingston Quartet.

Guard and Reynolds contacted former Calypsonian member Shane (who was performing part-time in Honolulu) asking him to join the reconstituted group.

With help from the Trio's bassist and musicologist David "Buck" Wheat, Guard embarked on a self-education program of learning more about harmony, becoming more and more disenchanted with what appeared to him to be a lack of willingness or effort to "improve" on the part of his partners.

[5] By late 1960 Guard's frustration and discontent with his partners,[6] combined with an alleged embezzlement of the group's finances, had reached a point where he no longer wanted to work with Reynolds and Shane.

They toured and released an album and were asked to perform several folk songs on the Academy Award-winning soundtrack of How the West Was Won.

Judy Henske was eventually replaced by Liz Seneff, but the Whiskeyhill Singers were disbanded in late 1962 after Guard left for Australia.

In late 1962 Guard moved with his family to Sydney, Australia, where he purchased a home overlooking the South Pacific Ocean at Whale Beach.

He performed both under his own name, anonymously and under an alias as a supporting musician and vocalist on Australian recording sessions with, among others, Lionel Long, The Twiliters, The Green Hill Singers, Tina Date, and The Tolmen.

[11] In 1981, Guard reunited with Shane and Reynolds for a PBS fundraising concert and program entitled "The Kingston Trio and Friends Reunion".

He did four tracks on a 12-track cassette recorded to accompany the "All Along the Merrimac" tour of New Hampshire and a final solo album, Up & In (1988), which received mixed reviews.

Over the years following his return to the US, Guard worked with a number of people, including Alex Hassilev, Mike Settle, Judy Henske, Cyrus Faryar, Tim Buckley, Tommy Makem and David White.

His memorial service in Portsmouth, New Hampshire, was attended by Bob Shane, Glen Yarbrough, the Limeliters and many other figures from the folk world.