可以。 做“慈善团体，慈善事业”时做复数，可数。做慈悲，仁爱，博爱时，做不可数名词。
请看解释。
1. 慈悲,仁爱,博爱;慈善[U]
She gave the beggar some money out of charity.
她出于慈善给乞丐一些钱。
2. 施舍;善举[U]
Poor as they were, the old couple never asked for charity.
老两口虽然很穷,但从不请求施舍。
3. 慈善团体,慈善事业[C]
The rich lady left all her money to charities.
那个阔太太把所有的钱都捐给慈善事业。
The fire victims received food and clothes from several charities.
火灾灾民从数个慈善团体收到食物和衣服。