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Marissa Niroj (born 26 April 1979) is a Thai former professional tennis player. She is now known as Marissa Kroon.
Niroj, a world top-100 junior, made her only WTA Tour main draw appearance at the 1997 Pattaya Open. She reached a career high singles ranking of 506 while competing on the professional tour.
At the 1997 Southeast Asian Games in Jakarta, Niroj won a silver medal for Thailand in the team event and partnered with Suvimol Duangchan for a bronze medal in the women's doubles.
In 1999 she was a member of the Thailand Fed Cup team and appeared in a total of four ties, winning one singles and two doubles rubbers.
| Runner-up | 1. | Sep 1996 | Samutprakan, Thailand | Hard | Suvimol Duangchan | 5–7, 4–6 |
| Runner-up | 1. | Sep 1996 | Samutprakan, Thailand | Hard | Pirada Witoonpanich | Suvimol Duangchan Phorhathai Suksamran | 4–6, 4–6 |
| Runner-up | 2. | May 1998 | Maryborough, Australia | Clay | Suvimol Duangchan | Lisa McShea Monika Maštalířová | 4–6, 0–6 |
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