The present invention relates to antisense oligonucleotides that are capable of modulating expression of ATXN2 in a target cell. The oligonucleotides hybridize to ATXN2 mRNA. The present invention further relates to conjugates of the oligonucleotide and pharmaceutical compositions and methods for treatment of neurodegenerative diseases such as spinocerebellar ataxia type 2 (SCA2), amyotrophic lateral sclerosis (ALS), Alzheimer's frontotemporal dementia (FTD), parkinsonism and conditions with TDP-43 proteinopathies using the oligonucleotide.