标准解析度电视、标准清晰度电视（standard-definition television），又称标准画质电视、标清电视、SDTV，是指分辨率达到720x576像素的标准，但还不足以称为高分辨率（High Definition）的电视系统。这个定义通常适用在数字电视中，特别是指与传统模拟系统有着相同（或近似）分辨率的播送信号。而录像的媒体中以DVD盘片VHS录像带，就是相当这个规格。

能够播送SDTV的标准包括DVB、ATSC和ISDB。后两项原本是为了高解析电视（HDTV）而开发，但更常被用在透过多路复用（multiplexing）发送多重SD影像和声音串流。

Standard-definition television (SDTV) is a television system that uses a resolution that is not considered to be either high-definition television (720p, 1080i, 1080p, 1440p, 4K UHDTV, and 8K UHD) or enhanced-definition television (EDTV 480p). The two common SDTV signal types are 576i, with 576 interlaced lines of resolution, derived from the European-developed PAL and SECAM systems; and 480i based on the American National Television System Committee NTSC system. Standard definition television also provides a picture quality similar to VHS (Video Home System). SDTV and high definition television (HDTV) are the two categories of display formats for digital television (DTV) transmissions, which are becoming the standard.