Marţolea is a demonic creature in Romanian mythology (especially in the regions of Bukovina and Maramureş) who lives up in the mountains and descends on Tuesday nights to lure working women with her singing and punish them.

Called also Marţ Sara (the old Romanian words for "Tuesday Evening"), it is a malefic entity, who demands the semi-holy day (holiday) of Tuesday to be respected and she forbids four women's chores: spinning of the wool, sowing, boiling laundry and baking bread. This makes it a pagan being and a false deity in pre-Christian times.

Marţolea's punishments for these things are harsh like: killing by ripping, hanging the guts on nails to the wall and around the dishes, in the unmarried women's cases. For the married women, the punishments are killing or possessing their babies or their husbands who are far from home.

Usually her form is of a big old woman dressed all in black, to some men she comes as an ugly soldier warrior, or as a handsome gentleman. To married women, she manifest herself as an old woman, to married men as a virgin and to unmarried women as a young charming man.

In some regions, she is called Joimâriţa, another form of the Romanian word for Tuesday.

Also, Marţolea repays the women who keep the Tuesday day sacred by leaving them eggs on their doorstep or flowers from the highest mountains in Bukovina.