Harry Diamond is a Northern Irish professional golf caddie and former accomplished amateur golfer best known as the longtime caddie for world-class golfer Rory McIlroy. Their partnership, which began in 2017, stands out not just for on-course success but for a deep, brother-like friendship that dates back to childhood in Holywood, Northern Ireland.
Early Life and Background
Diamond grew up in Holywood, County Down, Northern Ireland, where he met a young Rory McIlroy on the putting green at Holywood Golf Club. Diamond, about two years older, quickly became a close friend and something of a big brother figure to McIlroy, who was an only child.
The two shared a passion for golf from a young age. Diamond enjoyed success as an amateur, representing Ireland and winning the prestigious West of Ireland Championship in 2012, which earned him a spot in that year’s Irish Open. He reached a handicap of +2.5 at his peak but chose not to pursue a professional playing career. Before becoming a full-time caddie, he worked in the family business and reportedly owns several small businesses, including bars.
Profession and Career with Rory McIlroy
Diamond first caddied for McIlroy informally, including at the 2005 Irish Open when Rory was just 16. Their professional collaboration started in 2017 after McIlroy parted ways with longtime caddie J.P. Fitzgerald. What began as a trial quickly became permanent, thanks to their unbreakable trust and shared history.
Diamond is known for his low public profile—he rarely gives interviews and prefers to stay out of the spotlight. McIlroy has often praised him for providing comfort and stability on the course, describing him as someone who prevents overreactions to mistakes. Their bond deepened through major triumphs, including McIlroy’s Masters victories, with Diamond receiving significant shares of prize money.
Personal Life: Wife and Kids
Diamond is married to Claire. The couple has two children. He has taken time off the PGA Tour for family milestones, such as the birth of his first child around 2019 and the second around 2022.
Prior to his marriage, Diamond was engaged to Irish designer Katie Larmour for about five years. They parted ways around 2014, around the same time McIlroy ended his own engagement.
Details about his parents remain private, consistent with Diamond’s preference for keeping his family life low-key. He grew up in a supportive environment in Holywood that fostered his love of golf.
Age, Height, Weight, and Physical Profile
Diamond turned 40 in 2024, placing his birth year around 1984. As of 2026, he is approximately 42 years old.
Public details on his exact height and weight are scarce, as he maintains a private personal profile. As a former competitive amateur golfer and active caddie, he maintains good physical fitness for the demands of walking 18+ holes multiple days a week, often in varying weather conditions. He has an athletic build typical of someone with a sports background that includes golf and possibly other activities.
Net Worth
Harry Diamond’s net worth is estimated in the $2.5 million to $3 million range (approximately €2.2–2.6 million). This comes primarily from his earnings as McIlroy’s caddie—typically 5–10% of prize money plus salary and bonuses—plus his business ventures.
McIlroy has earned well over $100–120 million in on-course prize money during their partnership, translating to substantial income for Diamond (estimated career caddie earnings exceeding $10–12 million in some reports). A single major win, like a Masters title with a $4.5 million purse, can net the caddie hundreds of thousands.
Quick Facts Table
| Aspect | Details |
|---|---|
| Full Name | Harry Diamond |
| Age (2026) | ~42 years old (born ~1984) |
| Profession | Professional golf caddie; former amateur golfer |
| Known For | Caddie for Rory McIlroy since 2017 |
| Net Worth | ~$2.5–3 million |
| Wife | Claire (married; previous engagement to Katie Larmour) |
| Kids | 2 children |
| Height/Weight | Not publicly detailed; athletic build |
| Parents | Private (grew up in Holywood, Northern Ireland) |
| Hometown | Holywood, County Down, Northern Ireland |
Legacy and Relationship with McIlroy
Beyond the numbers, Harry Diamond’s story highlights the value of lifelong friendship in elite sports. McIlroy has called him the “big brother I never had” and credited their bond for emotional stability during high-pressure moments.
Diamond was McIlroy’s best man at his 2017 wedding, and the two have supported each other through career highs and challenges. Their partnership exemplifies loyalty, with Diamond helping McIlroy navigate the grind of professional golf while maintaining a grounded perspective rooted in their shared Northern Irish roots.
As McIlroy continues competing at the highest level, Harry Diamond remains a steady, trusted presence—proving that sometimes the most important relationships in sport are the ones formed on childhood putting greens.
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FAQs
How much does Harry Diamond earn?
Harry Diamond earns a weekly salary of around $2,000–$4,000 plus 5–10% of Rory McIlroy’s prize money. His annual earnings are typically in the mid six to low seven-figure range (often $1.5–3+ million in strong years).
Who is Harry Diamond?
Harry Diamond is a Northern Irish former amateur golfer who has been Rory McIlroy’s professional caddie and close friend since 2017.
Who is Rory McIlroy’s best friend?
Rory McIlroy’s best friend is Harry Diamond, his longtime caddie and childhood friend from Holywood, Northern Ireland.
What nationality is Harry Diamond?
Harry Diamond is Northern Irish.