பேச்சு (Speech) என்பது மனிதக் குரலின் மூலமாக மொழியைப் பயன்படுத்தி மேற்கொள்ளப்படும் தொடர்பாடலாகும். ஒவ்வொரு மொழியும் உயிரெழுத்து மற்றும் மெய் ஒலிகளின் ஒலிப்புச் சேர்க்கைகளைப் பயன்படுத்தி சொற்களின் ஒலியை உருவாக்குகிறது.

Speech is a human vocal communication using language. Each language uses phonetic combinations of vowel and consonant sounds that form the sound of its words, and using those words in their semantic character as words in the lexicon of a language according to the syntactic constraints that govern lexical words' function in a sentence. In speaking, speakers perform many different intentional speech acts, e.g., informing, declaring, asking, persuading, directing, and can use enunciation, intonation, degrees of loudness, tempo, and other non-representational or paralinguistic aspects of vocalization to convey meaning. In their speech, speakers also unintentionally communicate many aspects of their social position such as sex, age, place of origin, physical states, psychological states, physico-psychological states, education or experience, and the like.