Selain itu, terdapat juga Kardinal Reinhard Marx yang mengapresiasi Marx sebagai fondasi awal lahirnya ajaran Sosial-Katolik. Dengan menekankan fokus Marx pada kesejahteraan materi dan keadilan sosial, mencerminkan tren yang lebih luas di beberapa kalangan progresif Katolik yang berusaha selaras dengan aspek-aspek tertentu dari pemikiran Marxis. Ia memuji Marx karena menunjukkan bahwa hak asasi manusia tidak akan sempurna tanpa hadirnya kesejahteraan material di masyarakat dan mengakui perhatian Marx terhadap kondisi nyata kehidupan rakyat. Meski kontroversial, Reinhard Marx mengakui bahwa ajaran Sosial-Katolik bererutang budi dengan penekanan Marx kepada pengentasan kondisi-kondisi nyata masyarakat (kapitalisme).
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