The embassy did not single out any particular incidence, but its statement follows MDC-T intra-party violence which resulted in the attack of the party Deputy Treasurer General, Elton Mangoma, at Harvest House.
"We condemn such acts of violence which have no place in modern political discourse," said the embassy in a statement.
The US urged political parties to respect the rule of law, freedom of assembly and the right to free speech 'which should be the hallmark of modern democratic Zimbabwe'.
The US called on all parties to protect victims of violence and to prevent future acts of violence.
Mangoma was attacked by suspected pro-Morgan Tsvangirai youths for urging the MDC-T leader to step down.
Five suspects, James Chidhakwa, Francis Machimbidzofa, Enock Mukudu, Stefani Jahwi and Samson Nerwande have been arrested over the Mangoma attack.
Observers said the MDC-T violence could thaw relations between the west and the Tsvangirai party.
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