Maria Teuntje "Ria" van Velsen (born 18 May 1939) is a retired Dutch artistic gymnast who participated in the 1960 Summer Olympics.

She took part in all events, with the best achievement of 14th place in the team all-around competitions.

She is not related to the Dutch swimmer Ria van Velsen who also competed at the 1960 Games.

[1] After marriage to Thijs Rietveld in 1961 she was often credited as Ria Rietveld.

This biographical article related to Dutch artistic gymnastics is a stub.