美国线（英语：Open-High-Low-Close chart，OHLC chart），以竖立的线条表现股票价格的变化，可以呈现「开盘价、最高价、最低价、收盘价」，竖线呈现最高价和最低价间的价差间距，左侧横线代表开盘价，右侧横线代表收盘价，绘制上较K线简单。另有一种美国线仅呈现「最高价、最低价、收盘价」（HLC）三项消息。

另外，在线图的绘制上，也有人采用单色制图，并不影响「开盘价、最高价、最低价、收盘价」四项消息的呈现。

An open-high-low-close chart (also OHLC chart, or simply bar chart) is a type of chart typically used to illustrate movements in the price of a financial instrument over time. Each vertical line on the chart shows the price range (the highest and lowest prices) over one unit of time, e.g., one day or one hour. Tick marks project from each side of the line indicating the opening price (e.g., for a daily bar chart this would be the starting price for that day) on the left, and the closing price for that time period on the right. The bars may be shown in different hues depending on whether prices rose or fell in that period.