The increasing number of evidence has reported inflammation and oxidative stress as key mediators of osteoarthritis (OA) joint pathology. Therefore, the usage of dietary supplements targeting inflammation and oxidative stress in OA may emerge as a rewarding therapeutic strategy. This study aimed to explore the efficacy of antioxidant and anti-inflammatory dietary supplements used to manage OA. A methodological framework proposed by Arksey and O’Malley was used to conduct this scoping review. An electronic database search of English academic articles was conducted using PubMed, MEDLINE and ScienceDirect from 2000 to 2018. Randomized controlled trials (RCTs) of OA with parallel groups by comparing dietary supplements with placebo consumption were eligible for inclusion. Out of 69,150 studies identified, a total of 41 studies were included, with 25 antioxidant or anti-inflammatory dietary supplements identified. There were 3325 respondents (1740 in the treatment group and 1585 in the placebo group), all aged ≥ 25 years old and comprised of 69.6% and 30.4% female and male respondents, respectively. The majority of the studies recruited participants with knee OA (n = 33) with a follow-up duration of 3 to 32 weeks. Overall, most of the dietary supplements (n =17) demonstrated a beneficial effect on the clinical signs and symptoms, such as Boswellia serrata extract (BSE), Pycnogenol and L-carnitine. In contrast, Aquamin supplementation did not exert positive impacts on OA management, while inconsistent findings were observed in greenlipped mussel (GLM) extract, vitamin E, methylsulfonylmethane (MSM), licorice flavonoid oil (LFO), ginger, willow bark extract and rose hip supplementation. In summary, the role of anti-inflammatory and antioxidant dietary supplements cannot be ignored as they can offer alleviated pain and symptom relief.