This thread has been dormant for many years, but after seeing the Kate Moss mania at Bazaar this September, I thought I would try to update her list. This is mostly complete, however, there are some covers that I could not confirm existed or were in print, listed here:
Turkey (1998), Mexico (1999), Arabia (July/August 2012 by Terry Richardson), India (2013), Mexico (March 2010), Nederland (September 2019)
I believe Kate Moss may have the most Harper's Bazaar covers, closely competing with Gisele. If she gets a few more covers from this year's reprint and if she does have runway collage covers from the mid-90s that I could not identify due to low resolution, that could certify her as the model with the most HB covers.
Kate Moss / 72 COVERS
This list only counts main editions of Harper's Bazaar (excluding men's, living, collections, etc.), as well as digital covers and supplements, which are not included. Limited and/or special edition covers are counted. If the missing issues are take into account, she would have 78 covers.
1992: 2 covers
UK Harper's & Queen - October 1992 / by Michael Roberts
US Harper's Bazaar - December 1992 / by Patrick Demarchelier
1993: 3 covers
US Harper's Bazaar - January 1993 / by Peter Lindbergh / with Meghan Douglas, and Patricia Hartman
US Harper's Bazaar - July 1993 / by Patrick Demarchelier
UK Harper's & Queen - October 1993 / by Thierry LeGoues
1994: 1 cover
US Harper's Bazaar - April 1994 / by Enrique Badulescu
1995: 1 cover
Harper's Bazaar México - November 1995 / by ?
1996: 3 covers
US Harper's Bazaar - November 1996 / by Patrick Demarchelier
Harper's Bazaar Greece - December 1996 / by Patrick Demarchelier
Harper's Bazaar Korea - December 1996 / by Patrick Demarchelier
1997: 1 cover
Harper's Bazaar Russia - March/April 1997 / by Patrick Demarchelier
1998: 6 covers
US Harper's Bazaar - January 1998 / by Patrick Demarchelier
Harper's Bazaar Korea - February 1998 / by Patrick Demarchelier
US Harper's Bazaar - May 1998 / by Patrick Demarchelier
Harper's Bazaar Taiwan - May 1998 / by Patrick Demarchelier
Harper's Bazaar Korea - June 1998 / by Patrick Demarchelier
Harper's Bazaar Russia - June 1998 / by Patrick Demarchelier
1999: 1 cover
Harper's Bazaar Russia - December 1999 / by Richard Burbridge
2000: 1 cover
Harper's Bazaar Taiwan - January 2000 / by ?
2002: 5 covers
US Harper's Bazaar - April 2002 / by Sølve Sundsbø
Harper's Bazaar Taiwan - April 2002 / by Sølve Sundsbø
Harper's Bazaar Australia - May 2002 / by Sølve Sundsbø
Harper's Bazaar Korea - May 2002 / by Sølve Sundsbø
UK Harper's & Queen - June 2002 / by Sølve Sundsbø
2010: 5 covers
US Harper's Bazaar - March 2010 / by Peter Lindbergh
Harper's Bazaar Česká Republika - April 2010 / by Peter Lindbergh
Harper's Bazaar Thailand - April 2010 / by Peter Lindbergh
Harper's Bazaar Bulgaria - Spring 2010 / by Peter Lindbergh
Harper's Bazaar Japan - July 2010 / by Peter Lindbergh
2011: 5 covers
Harper's Bazaar Česká Republika - April 2011 / by ?
UK Harper's Bazaar - May 2011 / by Sølve Sundsbø
Harper's Bazaar Kazakhstan - June 2011 / by Sølve Sundsbø
Harper's Bazaar Korea - June 2011 / by Sølve Sundsbø
Harper's Bazaar Russia - June 2011 / by Sølve Sundsbø
2012: 10 covers
US Harper's Bazaar - June/July 2012 / by Terry Richardson
Harper's Bazaar Korea - July 2012 / by Terry Richardson
Harper's Bazaar Kazakhstan - July/August 2012 / by Terry Richardson
Harper's Bazaar Australia - August 2012 / by Terry Richardson
Harper's Bazaar Česká Republika - August 2012 / by Terry Richardson
Harper's Bazaar En Español - August 2012 / by Terry Richardson
Harper's Bazaar Indonesia - August 2012 / by Terry Richardson
Harper's Bazaar Thailand - August 2012 / by Terry Richardson
Harper's Bazaar Ukraine - August 2012 / by Terry Richardson
Harper's Bazaar Malaysia - September 2012 / by Terry Richardson
2014: 9 covers
US Harper's Bazaar - May 2014 / by Terry Richardson
Harper's Bazaar Argentina - June 2014 / by Terry Richardson
Harper's Bazaar Greece - June 2014 / by Terry Richardson
Harper's Bazaar Polska - June 2014 / by Terry Richardson
Harper's Bazaar Malaysia - June 2014 / by Terry Richardson
Harper's Bazaar Ukraine - June 2014 / by Terry Richardson
Harper's Bazaar Deutschland - June/July 2014 / by Terry Richardson
Harper's Bazaar Česká Republika - July 2014 / by Terry Richardson
Harper's Bazaar Japan - July 2014 / by Terry Richardson
2017: 1 cover
Harper's Bazaar Australia - October 2017 / by Nikolai Von Bismarck
2019: 8 covers
Harper's Bazaar Deutschland - September 2019 / by Mario Sorrenti
Harper's Bazaar España - September 2019 / by Mario Sorrenti
Harper's Bazaar En Español - September 2019 / by Mario Sorrenti
Harper's Bazaar Malaysia - September 2019 / by Mario Sorrenti
Harper's Bazaar Polska - September 2019 / by Mario Sorrenti
Harper's Bazaar Romania - September 2019 / by Mario Sorrenti
Harper's Bazaar Russia - September 2019 / by Mario Sorrenti
Harper's Bazaar Singapore - September 2019 / by Mario Sorrenti
2024: 1 cover
Harper's Bazaar France - March 2024 / by Robin Galiegue
2025: 9 covers
Harper's Bazaar Deutschland - September 2025 / by David Sims
Harper's Bazaar España - September 2025 / by David Sims
Harper's Bazaar France - September 2025 / by David Sims
Harper's Bazaar Italia - September 2025 / by David Sims
Harper's Bazaar Kazakhstan - September 2025 / by David Sims
Harper's Bazaar Nederland - September 2025 / by David Sims
Harper's Bazaar Qatar - Autumn 2025 / by David Sims
Harper's Bazaar Saudi Arabia - Autumn 2025 / by David Sims
Harper's Bazaar Srbija - September 2025 / by David Sims
STATS
BAZAAR'S 'BIG FOUR'
US Harper's Bazaar: 11 covers
UK Harper's Bazaar: 4 covers
Harper's Bazaar Italia: 1 cover
Harper's Bazaar France: 2 covers
TOP EDITIONS
1. US Harper's Bazaar: 11 covers
2. Harper's Bazaar Korea: 6 covers
3. Harper's Bazaar Russia: 5 covers
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Moss has been on the cover of 23/31 operating editions of Harper's Bazaar and 5/~7 defunct editions of Harper's Bazaar. To cover all editions, she must appear on the covers of BAZAAR for Arabia, Ecuador, Brazil, China, Hong Kong, India, Turkey, and Vietnam. Note, however, she may have been on the cover of Arabian and Turkish Bazaars.