Isabel Avellán (20 August 1933 – 20 September 2010) was an Argentine athlete.

[2] Avellán was born in 1933, and at the age of nineteen, she won the discus and the shot put events at the 1952 Argentine Championships.

[3] At the 1955 Pan American Games in Mexico City, Avellán won the silver medal in the women's discus throw,[4][5] setting a new national record.

[7] Avellán competed in the women's discus throw at the Olympics, finishing in sixth place out of 22 participants.

[11] After moving to Australia with her husband,[1] Avellán won the discus event at the 1960 Australian Athletics Championships.