Mien Suhadi is a former Indonesian tennis player.
In 1960, Suhadi won the Bandung Open, defeating Tan Liep Tjiaw in the final, 0–6, 0–6, 6–4.
She won the Jakarta Raya Championships in April 1962, beating Jooce Suwarimbo, 4–6, 7–5, 7–5. She and partner Suwarimbo won the doubles competition beating Vonny Djoa and Liem in the final, 6–1, 6–4. Later in that year, Suhadi and Suwarimbo reached the final of another Jakarta tournament, losing the final to the Australian pair of Fay Toyne and Val Wicks, 6–0, 8–6.
At the 1962 Asian Games in Jakarta, Suhadi won the bronze medal in the Women's Doubles with partner Jooce Suwarimbo.
In 1965, she and Lita Liem won the doubles competition of the Indonesian Gravel Invitational in Jakarta. She also reached the final of the singles competition, where she was defeated by Lita Liem.