买入持有策略（Buy and Hold）是一个长期的投资策略，它主要是建基在一段时间内尽管金融市场有一定的波动及衰退，但是仍然能给得到一个长期的特定收益率。

与之对立的策略是日内交易，日内交易是指风险资金只会在很短的时间进入市场（如一周甚至于数小时），并且只寻求找出相对的一段大幅度波动作套利。 买入持有策略被一些有效市场理论（EMH）支持者运用，有效市场理论是指证券在任何时间内的价格都是合理的，因为市场是有效而且价格已经反映了一切已知的及内幕消息，所以根本没有任何空间给予交易者交易行为，为此有人议买之入持有直至要用钱才沽出。

Buy and hold is an investment strategy where an investor buys stocks and holds them for a long time.

This is based on the view that in the long run financial markets give a good rate of return even while taking into account a degree of volatility. It says that investors will never see such returns if they bail out after a decline. This viewpoint holds that market timing, i.e. the concept that one can enter the market on the lows and sell on the highs, does not work; attempting such timing gives negative results, at least for small or unsophisticated investors, so it is better for them to simply buy and hold.