The nonmotor symptoms (NMS) in Parkinson’s disease (PD), though a very prevalent entity is often underreported due to lack of structured history taking by the physician as well as patients and relatives apathy towards these complaints. NMS like pain, urinary symptoms, depression and anxiety is reported in 21% of the patients at the time of presentation, which goes up to 88% after 7 years from disease onset. Involvement of nondopaminergic systems like locus coeruleus, dorsal vagal nucleus, raphe nuclei, hypothalamus, limbic cortex, neocortex are implicated as the cause for NMS in PD. This chapter covers the neuropsychiatric symptoms, complex behavioral disorders, sensory symptoms, sleep disorders, dysautonomia, and nonmotor fluctuations (NMFS).