Ursa Astronomical Association (Finnish: Tähtitieteellinen yhdistys Ursa ry) is the largest astronomical association in Finland.

Founding members include a renowned Finnish astronomer Yrjö Väisälä.

Ursa's primary functions include advancing amateur astronomy and astronomical education.

[1] They have published a magazine Tähdet ja avaruus since 1971 and have provided awards to exceptional members of amateur astronomy for significant astronomical observations since 1988.

[4] The organization has thirteen sections specialized in different aspects of amateur astronomy (and meteorology): In addition, Ursa has two loosely organized hobby groups: