Cyclocephala is a genus of scarab beetles from the subfamily Dynastinae (Coleoptera, Scarabaeidae). Beetles of this genus occur from southeastern Canada to Argentina, India and the West Indies.

Adults of this genus are nocturnal or crepuscular, and are usually attracted to lights.

Taxonomy: It was published by Pierre François Marie Auguste Dejean in 1821. It is the type genus of the tribe Cyclocephalini.
Selected species: This is a large genus and new species continue to be added.

• Cyclocephala almitana
• Cyclocephala amazona
• Cyclocephala amblyopsis
• Cyclocephala atripes
• Cyclocephala atripes
• Cyclocephala barroensis
• Cyclocephala brittoni
• Cyclocephala borealis - Northern masked chafer
• Cyclocephala carbonaria
• Cyclocephala cartwrighti
• Cyclocephala castanea
• Cyclocephala castaniella
• Cyclocephala colasi
• Cyclocephala complanata
• Cyclocephala concolor
• Cyclocephala confusa
• Cyclocephala conspicua
• Cyclocephala discicollis
• Cyclocephala discolor
• Cyclocephala elegans
• Cyclocephala epistomalis
• Cyclocephala erotylina
• Cyclocephala fasciolata
• Cyclocephala fulgurata
• Cyclocephala gravis
• Cyclocephala gregaria
• Cyclocephala hardyi
• Cyclocephala herteli
• Cyclocephala hirta - Western masked chafer
• Cyclocephala howdeni
• Cyclocephala kaszabi
• Cyclocephala krombeini
• Cyclocephala laminata
• Cyclocephala ligyrina
• Cyclocephala lunulata
• Cyclocephala lurida
• Cyclocephala macrophylla
• Cyclocephala maffafa
• Cyclocephala melanae
• Cyclocephala melanocephala
• Cyclocephala modesta
• Cyclocephala nigerrima
• Cyclocephala nigritarsis
• Cyclocephala nigrobasalis
• Cyclocephala nodanotherwon
• Cyclocephala pan
• Cyclocephala pardolocarnoi
• Cyclocephala porioni
• Cyclocephala prolongata
• Cyclocephala puberula
• Cyclocephala pubescens
• Cyclocephala putrida
• Cyclocephala quadripunctata
• Cyclocephala rubescens
• Cyclocephala sanguinicollis
• Cyclocephala santaritae
• Cyclocephala sexpunctata
• Cyclocephala signaticollis
• Cyclocephala sparsa
• Cyclocephala spermophila
• Cyclocephala stictica
• Cyclocephala testacea
• Cyclocephala variabilis
• Cyclocephala weidneri
• Cyclocephala zodion

Etymology: The generic name Cyclocephala means "round head".

Pollination: Flowers of Nymphaea subg. Hydrocallis are pollinated by Cyclocephala beetles. Likewise, flowers of Victoria are pollinated by Cyclocephala.
Predation: Several species of Cyclocephala serve as hosts for the parasitic larvae of the South American robber fly Mallophora ruficauda, especially C. signaticollis.
Herbivory: The larvae are root feeders.