In The Great Gatsby, in what ways does Tom Buchanan lie, deceive or tell only half truths to other characters in the novel and to the...

There are two major examples of Tom outright lying or deceiving people in "The Great Gatsby".  The first is in the beginning of the novel when Tom is having an affair with Myrtle.  While Daisy may suspect or have been told about it by others, Tom has not come out and been truthful with Daisy about his affair or perhaps the reason behind the affair.

Tom also lies out right to George Wilson, saying it was Jay Gatsby who was driving the car that killed Myrtle, and not Daisy.  Though his protection for Daisy, and perhaps Daisy herself, prompted Tom to lie in this way, the lie resulted in Gatsby's death (which may or may not have been Tom's intention in the first place).