證人 (Chèng-jîn) (證人) 是 (sī)案件 (àn-kiāⁿ)的 (ê)相關 (siong-koan)kiàn證人，怹 (in)佇咧 (tī-leh)刑事 (hêng-sū)抑是 (ia̍h-sī)民事 (bîn-sū)相告 (sio-kò)中 (tiong)，提供 (thê-kiong)證詞 (chèng-sû)來 (lâi)描述 (biâu-su̍t)參 (chham)案件抑是相告相關的人士時地物 (jîn-sū-sî-tē-bu̍t)，以 (í)協做 (hia̍p-chō)書法 (su-hoat)審判 (sím-phoàⁿ)的進行 (chìn-hêng)。由 (Iû)案件抑是相告相關的原告 (goân-kò)抑是被告 (pī-kò)抑是怹的 (in-ê)辯護士 (piān-hō͘-sū)聲請 (seng-chhéng)傳喚 (thoân-hoàn)，才過 (chiah-koh)由法院 (hoat-īⁿ)開 (khui)傳票 (thoân-phiò)，傳 (thoân)證人到 (kàu)法院做證 (chò-chèng)。佇 (Tī)一寡 (chi̍t-koá)刑事的案件中，有當時 (ū-tang-sî)會 (ē)照 (chiàu)證人敢 (kám)有 (ū)坦白 (thán-pe̍h)佮 (kap)伊 (i)涉案 (sia̍p-àn)的程度 (thêng-tō͘)，可能 (khó-lêng)會對 (ùi)證人的身份 (sin-hūn)轉做 (choán-chò)被告。