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Gregg Eugene Harris (born November 23, 1952, in Dayton, OH) was a figure in the Christian homeschooling movement from 1981 through the mid-1990s and later served as a teaching elder at Gresham Household of Faith, which was an experiment in local church reform. According to the Home School Legal Defense Association, his work helped launch the Christian homeschooling movement in the United States, Canada, Australia and Mexico. Over 180,000 families attended his seminars. His book The Christian Home School was a Christian Booksellers Association best seller in March 1988. The list was published by the CBA and was on file in the offices of Noble Institute.
Gregg's wife, Sono, died on July 4, 2010, after a short battle with cancer. Gregg and Sono's three younger children Sarah, Isaac, and James live in Gresham, Oregon. He was the director of the Noble Institute, a non-profit educational organization.
As of 2017, Harris is the owner and proprietor of Roosevelt's Terrariums in Portland, Oregon.
One of the main ideas promoted by Gregg Harris is the principle of delight-directed study. This is the basis of Harris's homeschool, child training, and church reform activities.
Harris bases this principle on Psalm 111:2, "Great are the works of the LORD, they are pondered by all who delight in them." He reasons that because God is good, everything that is necessary for human life is also a source of pleasure. It is when the pleasures of God are separated from the purposes of God for those pleasures that an activity becomes sinful, "God dishonoring", and self-destructive.
Harris interpretes this principle to state that boredom is the absence of learning (or mental hunger) and loneliness the absence of social connectedness (or social hunger). Therefore, education and study, for good or ill, is nurtured best through what he calls the "power of companionship" among "fellow enthusiasts". All of these ideas are laid out in his various seminars and workshops as described on the blog of Noble Institute.
According to his principle, many social ills are actually the negative consequences of delight-directed study among foolish, often age-segregated people, (e.g. drug abuse and gang membership), while many of the greatest human accomplishments are the consequence of delight-directed study among wise, age-integrated fellow enthusiasts (e.g. in science clubs, hobby groups and other affinity groups). Harris argues that this is why academic and hobby clubs are often more effective than classes offered on the same subjects. The social forces in a classroom are often at odds with its very purpose, whereas the social forces in a well-run club are more supportive of excellence in the topic of interest to the club.
Some of Gregg Harris's seven children have gained recognition.
His twin sons, Alex and Brett Harris (born in 1989), were the founders of The Rebelution, a Christian teen website and authors of the book Do Hard Things: A Teenage Rebellion Against Low Expectations.
In addition to his seven children, Gregg Harris has fifteen grandchildren.
Seelhoff's business, which promoted home education and traditional family life, had suffered when her involvement with a man other than her husband became known. After her remarriage, she brought suit against a number of homeschooling leaders for various causes of action including defamation, slander, intentional infliction of emotional distress, intentional interference with commerce, and violation of the Sherman Antitrust Act. 
Seelhoff mentioned Harris in her original complaint. Harris' insurance company settled out of court before legal proceedings began.
- Court report, HSLDA.
- "Roosevelt's Terrariums: Their Expertise is Growing". The Southeast Examiner of Portland Oregon. 2015-05-01. Retrieved 2019-08-10.
- Harris 1988.
- "Delight-Directed Study".
- Lawsuit, Homestead.
- "Jury Finds Teaching Home Editor Conspired to Restrain Trade – Defendants Gregg Harris, Mary Pride, Sue Welch Settled". Retrieved 2008-07-29..
- "How a rising star of the religious right was 'ex-communicated'". theweek.com. 2017-12-31. Retrieved 2019-08-10.
- "Delight-Directed Study". Retrieved 2008-07-29.
- Harris, Gregg (1988). The Christian Home School. Wolgemuth & Hyatt. ISBN 0-943497-06-X.