I've tested hundreds of mascaras and 9 of my favourites are on sale for Prime Day

Frequently Asked Questions: How I tested the best Amazon Prime Day mascara deals As someone who’s been writing about beauty for over five years, I’ve tested more mascaras than I’ve had hot dinners – and I have very strong opinions about what makes a good one. This list combines viral favourites, editor-loved formulas and tried-and-tested mascaras I’ve recommended time and time again. Every mascara featured here ticks all of the following boxes: A cult reputation backed by thousands of five-star reviews. A Prime Day saving that actually makes it worth buying now. A wand and formula that delivers - whether that’s sky-high length, lift, volume, curl, or all four. A personal favourite I’ve reached for again and again (looking at you, Sky High). Whether you want a clean definition, voluminous, fluffy lashes or something that won’t smudge by 4 pm, there’s a mascara in here that genuinely deserves the hype and the discount. And yes, I’ve sifted through dozens of deals to weed out the duds - because not all Prime Day sales are as good as they seem. Why you can trust me As a shopping writer, I’ve spent years covering beauty trends and launches for titles including Glamour , ELLE and Cosmopolitan . I’ve personally tested more mascaras than I can count, from the best brown mascaras and tubing mascaras to waterproof formulas designed to withstand heat and humidity. Over the years, I’ve interviewed some of the industry's best-known makeup artists, chemists, and founders, giving me a deep understanding of what separates a good mascara from a truly great one to help you shop with confidence. When is Amazon Prime Day 2026? Beauty lovers, Amazon Prime Big Deal Days 2026 is officially here! Running across 6-7 October in the UK, the two-day sale is bringing discounts across beauty, fashion, tech, home and more. If a new mascara has been sitting on your wishlist, now’s the time to shop. We’ve already spotted plenty of beauty deals, including the mascara offers featured in this guide. And with new discounts dropping throughout the event, be sure to check back as we round up the hottest mascara deals worth adding to your basket. What is Amazon Prime Day? Launched in 2015 to celebrate Amazon’s 20th birthday, Prime Day has grown into the online giant’s most-hyped annual sale. Once a humble 24-hour tech fest, it’s now a multi-day event exclusive to Prime members – serving limited-time deals across everything from smart TVs to smart mascaras. And while Prime Day is often associated with big-ticket gadgets, the beauty deals quietly slay. Mascaras that rarely ever go on sale (we see you, L’Oréal Telescopic) are now up to 50% off, and many of the best-rated options are under a tenner.