Hop-Up may refer to:
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Hop-up (airsoft)
Hop-up {{cite book, author=Kovacs Bloomfield, title=Airsoft! How to Win an Airsoft War: Secret Tactics for Success Revealed!, url=https://books.google.com/books?id=Y8tuufbh_NAC&pg=PA20, date=1 March 2012, publisher=Ebook.GD Publishing, isbn=978-1- ...
, a piece of rubber increasing range of airsoft gun with Magnus effect.
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Hop-up (TT-01), aftermarket gears for R/C chassis made by Tamiya
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