A suicide blast wrecked an Afghan military bus in Kabul, killing seven soldiers, while a senior court official was assassinated in the city and 12 Afghan mine clearance workers were gunned down in the south.
Two NATO soldiers were also killed yesterday in an attack in the east of Afghanistan, the International Security Assistance Force (ISAF) said in a statement, without identifying their nationality.
The Taliban claimed responsibility for all the attacks.
The bloodshed has wrecked claims that the insurgency is weakening and has highlighted fears that Afghanistan could trip into a spiral of violence as the US-led military presence declines.
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NATO's force in Afghanistan will change at the end of the year from a combat mission to a support role, with troop numbers cut to about 12,500 - down from a peak of 130,000 in 2010.
Today, a suicide bomber on foot detonated explosives next to the military bus in central Kabul, destroying the vehicle in one of the busiest parts of the city as people left work.
The Taliban have often targeted buses that take government and military personnel to and from work everyday in Kabul, despite efforts by security forces to provide protection for the vulnerable vehicles.
Earlier in the day, Taliban gunmen shot dead a senior Supreme Court official in the city as he left his home.
Insurgents also killed 12 mine clearance workers in the restive southern province of Helmand in attack that President Ashraf Ghani condemned as "unjustifiable and un-Islamic".
On Thursday, a Taliban suicide bomber blew himself up among the audience attending a performance at a French cultural centre in Kabul, killing one German national and wounding 15 others.