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Greenspace provides ecosystem services that can improve health and well-being and contribute to climate change adaptation. The distribution of greenspace is unequal in populations, however, little is known regarding type, size, and accessibility of parks among different socioeconomic groups. This study explored inequities of urban parks by socioeconomic status in Seoul, South Korea. Demographic and socioeconomic data for 23,004 Seoul residents were obtained from the 2015 Community Health Survey. The park provision was measured by total park area per capita, distance to the closest park, and park accessibility index determined by size and proximity of parks for each study district using the 2015 geographical park data. Regression analyses estimated the relationships between individual’s socioeconomic status and the park provision metrics. Results showed different implications among the considered metrics: people with household income ≥ the high-income threshold ($5,000/month) had lower district-level accessibility index values by -20.18 km (95% CI: -27.42, -12.94) but larger total park area per capita by 0.16 km²/person (95% CI: 0.07, 0.25), compared to people below the high-income threshold. The average size of parks in 1-km buffers aggregated for each district was larger for persons with higher education level (≥ Bachelor’s degree) by 3324 m² (95% CI: 2263, 4385) and for people with ≥$5,000 monthly household income by 1672 m² (95% CI: 632, 2713). Persons supported by government subsistence (-3808 m², 95% CI: -7105, -511) and those with multiracial families (-5040 m², 95% CI: -9964, -115) had smaller park size. These results differed by park types. This study indicates that simply metrics may obscure differences among park provisions. This may bias estimation of park inequity and in turn affect estimation of health impacts of greenspace. We suggest that park accessibility based on detailed metrics should be considered in urban planning and health impact assessments for greenspace.