There is a problem with listing the papers of Nikolaos I Hatzidakis since his father Ioannis N Hazzidakis was also a mathematician who, like his son, wrote papers on differential geometry. The father wrote papers in German mostly under the name J N Hazzidakis, but seems to have written a few as J N Hatzidakis. His son, however, mostly wrote under the name N J Hatzidakis, but seems to have written a few as N J Hazzidakis. We are aware that our list of the papers of Nikolaos I Hatzidakis which we give below is incomplete, certainly some Greek papers are missing. The list is remarkable for containing papers in French, Greek, German, English, Italian and Danish.