Creator
- Robertson, J. D.1
- Robertson, Leon1
- Robinson, Albert G. (Albert Gardner), 1855-19321
- Robsjohn-Gibbings, T. H. (Terence Harold), 1905-19761
- Rodgers, Covington1
- Rogers Fence Company1
- Ross, Reuben1
- Rothwell, Selim1
- Roubaud, Benjamin1
- Rousseau, G.1
- Ruiz, Stephen1
- Rupp1
- Rutgers University1
- Ryan, Thomas1
- Régamey, Frédéric1
- San Francisco Bridge Company1
- Sanders, Thelma1
- Sandusky, William H.1
- Santa Barbara Museum of Art1
- Santeuil, Ch.1