- Noel, Sterling1
- Open Society Archives at Central European University1
- Orr, Charles Andrew1
- Orwell, George1
- Palotai, Boris1
- Paul, Leslie Allen1
- Pavelkin, Petr Artem'evich1
- Payne, Robert1
- Polish Lawyers' Association, London1
- Polish Unit of RFE/RL Research Institute; RFE/RL RI1
- Riezler, Walter1
- Roberts, Henry L.1
- Rogers, Edward1
- Romanian Unit1
- Rosenstock-Huessy, Eugen1
- Rossi, A.1
- Rákosi, Mátyás1
- Samizdat Archives of Radio Free Europe1
- Schueller, George K.1
- Schultheiss, Karl1