PK Keski-Uusimaa (W)
RoPS (W)
TuWe Women
VIFK (W)
HPS (W)
FC Ilves II (W)
TPS (W)
ONS (W)
EBK (W)
FC Sport 1939 Women
NJS (W)
P-Iirot Women
TPV Women
HauPa Women
FC Hertta (W)
PK-35 (W)
VJS (W)
GBK Women
FC Honka (W)
JyPK (W)
SC KuFu 98 Women
HJK II (W)
FC Lahti (W)
Tips Vantaa Women
PK-35 Vantaa (W)
IK Myran Women
MPS Women
KTP (W)
KuPS Akatemia Women
United Pietarsaari Women
Nice Futis Women
Ilves (W)
Kokkola Futis 10 Women
Sudet Women
HJS (W)
Naisten Ykkönen (Swedish: Damettan, Women's First/One) is the second highest division of women's football in Finland. It is overseen by the Suomen Palloliitto (Football Association of Finland). Teams in Naisten Ykkönen can gain promotion to the top-tier Kansallinen Liiga or be relegated to the third-tier Naisten Kakkonen. At the conclusion of the 2019 season, PK-35 Vantaa gained promotion to the Kansallinen Liiga as champions of the Naisten Ykkönen and PK-35 gained promotion by winning the promotion/relegation series against IK Myran. Conversely, GBK Kokkola and Ilves/2, were relegated to the Naisten Kakkonen at the conclusion of the 2019 season.
The league was founded in 1984 as the Naisten I divisioona (Women's Division 1). The league was preceded by the Naisten perussarja (Women's Base Series), which played during 1973–1980, and the Naisten aluesarja (Women's Regional Series), which played during 1981–1983. Naisten I divisioona was renamed “Naisten Ykkönen” in 1996.