Nicodamidae is a family of araneomorph spiders with twenty-seven species in seven genera.

At the time of the review, only two genera were accepted, Nicodamus from Australia and New Guinea, and Megadictyna from New Zealand.

Based on a morphological cladistic analysis, Harvey divided the family into two subfamilies, Nicodaminae and Megadictyninae, and erected seven new genera.

[3] In 1967, Pekka T. Lehtinen proposed that Megadictynidae constituted a separate family, but this was not accepted by Harvey.

On the basis of molecular phylogenetic analysis, Dimitrov et al. re-established Megadictynidae in 2017, reducing Nicodamidae to seven genera.