To explore the knowledge, attitudes and practices regarding plagiarism in a large culturally diverse sample of researchers who participated in the AuthorAID MOOC on Research Writing. An online survey was designed and delivered through Google Forms to the participants in the AuthorAID MOOC on Research Writing during April to June 2017. A total of 765 participants completed the survey (response rate 47.8%), and 746 responses were included in the analysis. Almost all participants (97.6%) reported knowledge of the term “plagiarism”, and 89.1% of them understand the meaning of the term before joining the course. Most participants reported that their university does not provide access to plagiarism detection software (82.0%), and 35% participants admitted they had been involved in plagiarism during their education. Overall attitudes toward plagiarism (65.3 ± 10.93) indicated low acceptance of plagiarism. Moreover, low scores were reported for approval attitude (25.22 ± 5.63), disapproval attitude (11.78 ± 3.64), and knowledge of subjective norms (20.63 ± 5.22). The most common reason for plagiarizing was lack of time (16.1%), and the most common consequence was the perception that “those who plagiarize are not respected or seen positively” (71.4%). Developing country researchers appear to be familiar with the concept of plagiarism, but knowledge among the participants surveyed here was incomplete. Knowledge about plagiarism and awareness of its harmfulness must be improved, because there is an obvious relationship between attitudes toward plagiarism and knowledge, reasons and consequences. The use of plagiarism-detection software can raise awareness about plagiarism.