Robert P. Hollenbeck Sr. (November 5, 1931 – September 5, 2021) was an American Democratic Party politician who served six terms in the New Jersey General Assembly from the 36th Legislative District.

A veteran of the Korean War, he attended Albright College in Reading, Pennsylvania and technical trade schools before becoming a supervisor for Public Service Electric and Gas.

In 1973, Hollenbeck and Richard F. Visotcky were elected to the General Assembly from the newly created 36th district defeating incumbent Republican Assemblyman Peter J. Russo and East Rutherford mayor James L. Plosia.

[1][3] While in the Assembly, he sponsored legislation regarding the state's water supply master plan (which helped create the Manasquan Reservoir) and allowing for right turns at red traffic lights.

In addition to the coattails from Thomas Kean's landslide victory in the gubernatorial election, DiGaetano and Donovan also criticized the Assembly's policy of allowing a free buffet lunch to legislators while in session which the two incumbents had partaken.