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Background: Patient sex is known to affect patient outcomes in sports medicine. Historically, many studies on athletes have focused on male athletes and been generalized to female athletes., Hypothesis: Studies with female first or senior authors will isolate female athletes as study participants more frequently than studies with male first or senior authors., Study Design: Systematic review; Level of evidence, 4., Methods: Following PRISMA (Preferred Reporting Items for Systematic Reviews and Meta-Analyses) protocols, original research studies published between 2017 and 2021 that analyzed athletes were systematically screened from the 6 top sports medicine journals ( British Journal of Sports Medicine ; Arthroscopy: The Journal of Arthroscopic and Related Surgery ; Knee Surgery, Sports Traumatology, Arthroscopy ; American Journal of Sports Medicine ; Orthopaedic Journal of Sports Medicine ; Sports Health: A Multidisciplinary Approach ). Articles were included for analysis if they met the following criteria: (1) original sports medicine research study, (2) analysis involving athletes, and (3) inclusion of ≥10 participants. Exclusion criteria included (1) review articles of any type and (2) cadaveric studies. The determination of author sex was completed using the name-to-gender assignment algorithm Genderize.io (https://genderize.io/)., Results: A total of 1146 studies were included in quantitative analysis. There were 246 studies with a female first author (21.5%) and 191 studies with a female senior author (16.7%). When looking at all authors (first, senior, and intermediate), 19.9% were female. Female first authors were over 4 times more likely to isolate female athletes in clinical research than male first authors (17.5% vs 3.8%, respectively; P < .001). Female senior authors were approximately twice as likely to isolate female athletes compared with male senior authors (11.5% vs 5.8%, respectively; P < .001)., Conclusion: Female first authors were significantly more likely to perform research isolating female athletes. While improving the frequency of female athlete research is multifactorial, increasing the number of female researchers may have a direct effect on improving gender equality in sports medicine research., Competing Interests: One or more of the authors has declared the following potential conflict of interest or source of funding: K.B.F. has received consulting fees from DePuy, Vericel, Medical Device Business Services, and Innocoll and support for education from Liberty Surgical. M.E.B. has received support for education from Gotham Surgical, Smith & Nephew, and Arthrex and research support from Arthrex. AOSSM checks author disclosures against the Open Payments Database (OPD). AOSSM has not conducted an independent investigation on the OPD and disclaims any liability or responsibility relating thereto.