The invention provides cell penetrating peptide-nucleic acid conjugates havingthe formula P- L-N, wherein P is a cell penetrating peptide, N is a nucleic acid,preferably an oligonucleotide and more preferably a siRNA, and L is a hydrophilicpolymer, preferably a polyethylene glycol (PEG)-based linker linking P andN together. Compositions, methods of use and methods for producing such conjugatesare also disclosed.