Phonological Problems, Faced by Sindhi Speaking Students (In Speaking English) at College Level in District Naushahro Feroze, Sindh It is generally conceded that one kind of interference behavior, phoneme substitution, occurs when a learner unconsciously identifies or categorizes as L2 sound as being the same as a particular L1 sound (even though it differs from the L1 sound in the perceptions of native speakers of the L2). So it is natural for phonological differences to exist in the pronunciation of a second language speaker and a native speaker of the same language. Thus phonological problems of the Sindhi speaking students in speaking English are obvious. Close observation of the students enthused the researcher to find out the difference of the SSS in pronunciation in speaking English from Received Pronunciation (RP) and the factors involved in the deviation. To find out and record ‘deviation’ of the Sindhi speaking students’ pronunciation of the English language from the Standard English sounds, the respondents were asked to read out common words, short paragraphs and a page of dialogues and their reading was recorded in audiocassettes. Later on the recording of the respondents was heard along with the supervisor very carefully and was written in transcription and analyzed. The result shows that the articulation of almost all the students was similar in English pronunciation (sounds), accent and intonation. The factors: interference of mother tongue, age, society, culture, and standard of education involve in the phonological problems. Besides the recording, a questionnaire consisting of eight questions was given to the SSS to fill up. Later on answers of the questions were analyzed and incorporated in the thesis.