Cable giant Comcast Corp. is contemplating reviving its pursuit of 21st Century Fox, after its bid for the company’s entertainment assets was turned down despite being over 15% higher than that of eventual buyer Walt Disney Co., according to people familiar with the situation.

Disney struck a deal with Fox in December, agreeing to pay $52.4 billion in stock. Fox turned down a Comcast offer that was in the low-$60 billions range, the people said. The assets on the table in both offers were essentially the same, including the...